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Problem of universals

The problem of universals is a longstanding metaphysical question in philosophy that concerns the ontological status of properties or qualities—known as universals, such as redness, shape, or humanity—that appear to be shared by multiple distinct particular objects or individuals in the world. It fundamentally asks whether these universals exist as real entities independent of the particulars they characterize (a position known as realism), whether they exist only within or as abstractions from those particulars (immanent realism or moderate realism), or whether they are merely linguistic conventions, mental concepts, or names without independent existence (nominalism or conceptualism). This debate arises from the apparent "one-over-many" puzzle: how a single universal can be wholly present in many different things without being divided or multiplied, while also accounting for the "many-over-one" aspect of how one particular can instantiate multiple universals. The problem traces its origins to ancient Greek philosophy, particularly Plato's theory of Forms in works like the Republic and Phaedo, where he posited eternal, transcendent universals existing in a separate realm of perfect Ideas, accessible through reason but distinct from the imperfect sensible world. Aristotle, Plato's student, critiqued this extreme realism in his Metaphysics and Categories, arguing instead for immanent universals that exist only as forms inherent in material particulars (hylomorphism), rejecting their separate subsistence to avoid issues like the "Third Man" regress. These ancient foundations set the stage for medieval scholastic debates, intensified by the reintroduction of Aristotle's works via Islamic philosophers like Avicenna, leading to intense controversies in the 12th and 13th centuries over whether universals exist ante rem (before things, as divine ideas), in re (in things, as common natures), or post rem (after things, as mental abstractions). Key medieval figures advanced distinct solutions: defended bold , viewing universals as existing prior to particulars in 's mind; championed early , treating universals as flatus vocis (mere words or mental signs) without real essence; and synthesized a moderate , holding that universals exist in three ways—eternally in , potentially in things, and actually in the intellect—balancing Aristotle's with . later revived strict in the 14th century, applying his razor to eliminate unnecessary universals, insisting that only individuals exist and that predication arises from conceptual similarity rather than shared essences. These positions influenced later , including John Locke's and Immanuel Kant's , where universals become categories of human understanding imposed on experience. In , the problem persists in analytic metaphysics, informing debates in , , and even , with realists like David Armstrong defending universals as sparse, natural properties that ground laws of nature, while trope theorists (e.g., particulars as bundles of property instances) and resemblance nominalists offer alternatives to avoid to universals. Modern variants, such as or , extend the discussion to possibilities and mathematical structures, underscoring the problem's relevance to questions of identity, causation, and categorization in fields like and .

Overview of the Problem

Core Question and Formulations

In metaphysics, universals are repeatable properties or qualities that multiple distinct objects can share, such as the redness exemplified by various apples, roses, and sunsets. , by contrast, are unique, non-repeatable individuals that exist in only one location at a time, like a specific apple or a particular rosebush, which cannot be wholly present elsewhere. This distinction raises the core question of how shared properties among particulars are metaphysically possible without positing entities that transcend individual instances. The problem of universals received its classical historical formulation in Porphyry's (c. 268–305 CE), an to Aristotle's Categories, where he explicitly declined to answer but posed three pivotal questions about genera and species: whether they are real entities or merely situated in bare thoughts alone; if real, whether they are corporeal bodies or incorporeal; and whether they are separated from sensible particulars or exist in connection with them and derive their reality from such association. These questions framed the debate as an ontological inquiry into the status of general terms like "human" or "animal," which seem to apply predicatively to diverse individuals yet prompt uncertainty about their extramental existence. Modern restatements of the problem often recast it in terms of linguistic, conceptual, or logical analysis, asking whether universals are independent real entities, conventions of that facilitate , or constructs of the human mind. A notable example is W.V.O. Quine's criterion of (1948), which holds that a theory commits to the existence of universals only insofar as its canonical quantifies over them via bound variables, thereby tying the debate to the structure of scientific and philosophical discourse rather than intuitive predication. At its heart, the problem presents a : if universals exist independently of , the challenge arises of explaining their to instances through mechanisms like participation, whereby somehow share in or instantiate the universal; if universals do not exist as such, it becomes difficult to account for the truth of predications (e.g., "this apple is red") and the genuine similarities observed among diverse objects without reducing them to mere verbal resemblances.

Significance in Metaphysics and Epistemology

The problem of universals holds profound metaphysical significance, as the or non- of universals fundamentally shapes our understanding of what constitutes . If universals are real entities, they introduce abstract objects into the alongside concrete , challenging parsimonious views that limit to spatiotemporal individuals. This debate directly engages the "One over Many" problem, which seeks to explain how distinct can resemble one another—such as multiple objects sharing the of redness—without positing either repetition of unique qualities or transcendent shared forms. Realists argue that universals provide the metaphysical ground for such resemblances, while nominalists deny their , attributing similarity to linguistic or relational conventions, thereby influencing broader ontological commitments like the rejection of uninstantiated . In , universals play a crucial role in justifying processes of , , and the of scientific laws. They enable the inference from observed to universal claims, such as predicting that all instances of a will behave similarly in the future, addressing Hume's by positing necessary connections between universals as the basis for reliable patterns. For instance, in David Armstrong's realist framework, universals like mass and charge form contingent modal relations that necessitate outcomes, allowing inference to the best explanation for regularities and supporting universal generalizations beyond mere statistical probabilities. Without universals, epistemological arises regarding the justification of , as resemblances among would lack an objective foundation, undermining the rationality of scientific laws as relations among repeatable . The problem also intersects with key debates in metaphysics, including the principle of the , which states that no two distinct objects can share all properties. In bundle theories of objects, where particulars are conceived as collections of universals, this principle holds necessarily, as identical bundles of universals would constitute the same object, precluding numerically distinct but qualitatively identical entities. Similarly, trope offers an alternative by treating properties as particularized tropes—unique, non-repeatable instances like the specific redness of this apple—allowing resemblance through qualitative similarity among tropes without invoking shared universals, thus resolving the problem while maintaining a sparse of concrete qualities. Contemporary philosophy continues to draw on the problem of universals across interconnected domains. In the , it informs theories of meaning and , where universals may ground how predicates like "" successfully denote multiple objects, avoiding purely extensional accounts that fail to capture shared content. In the , universals facilitate concept formation by providing the abstract structure for categorizing experiences, enabling cognitive generalization from sensory particulars to mental representations. In the , the debate influences the analysis of natural kinds and , with realists viewing universals as essential for delineating objective scientific categories, such as chemical elements defined by shared dispositional , thereby supporting in empirical theories.

Ancient Philosophical Foundations

Platonic Forms and Realism

Plato's theory of Forms, articulated in dialogues such as the Republic and Phaedo, posits that universals exist as eternal, perfect, and immaterial ideals that transcend the sensible world of particulars. These Forms serve as the true objects of knowledge, while physical objects are imperfect copies or participants in them, deriving their qualities through imitation or participation. In the Phaedo, Socrates explains that the soul, being immortal and akin to the Forms, recollects them from a pre-existent state, allowing access to universal truths beyond sensory experience. A central argument supporting this realism is the "one over many," which addresses the problem of universals by asserting that the shared properties among multiple particulars require a single, unifying Form. For instance, the many beautiful objects in the world share their beauty only because they all participate in the one Form of Beauty, which itself is unchanging and not subject to variation. This reasoning appears in the Phaedo, where Socrates argues that without such a Form, predication of qualities like equality or beauty across instances would be inexplicable. Epistemologically, Plato maintains that genuine knowledge of universals is attained through rational insight rather than sensory perception, as the sensible world consists of fleeting approximations of the Forms. In the Republic's Allegory of the Cave, prisoners chained in a cavern perceive only shadows cast by artifacts, mistaking them for reality; escape to the outside world reveals the true forms illuminated by the sun, symbolizing the as the source of all intelligibility. This allegory illustrates how philosophers, through , ascend from opinion about particulars to understanding the eternal Forms. Even within Plato's framework, the theory faces internal challenges, notably the argument presented in the Parmenides. This critique posits an : if particulars participate in a Form to share its property, then the Form and particulars together require a higher Form to explain their similarity, leading to an endless chain of Forms. Parmenides raises this objection to Socrates' young formulation, highlighting the difficulty of participation without self-predication or separation issues.

Aristotelian Categories and Immanence

critiqued Plato's theory of separate Forms, arguing that universals such as substance, , and do not exist independently but are within things. In his Metaphysics, he contends that positing Forms as separate entities fails to explain the characteristics of sensible objects, as the of participation between Forms and particulars is vague and unproductive. Instead, maintains that universals reside only in the particulars they characterize, rejecting any separation that would render them causally inert for the material world. Central to Aristotle's alternative is his doctrine of hylomorphism, which views substances as composites of matter and form, where universals function as the formal principles actualizing potential matter. Matter provides the underlying substrate, while the form—embodying the universal essence—imparts the specific nature to the composite, ensuring unity without separation. For instance, the universal "humanity" is realized as the form that structures the matter of an individual body, making Socrates a particular human substance rather than a mere approximation of an abstract ideal. This immanent approach positions universals as integral to the existence and identity of sensible particulars, avoiding the need for transcendent entities. In the Categories, Aristotle elaborates on predication to clarify how universals relate to subjects, distinguishing between primary and secondary substances. Primary substances are the ultimate particulars, such as "this man" or "this horse," which exist independently and serve as the foundational subjects of predication. Secondary substances, including species like "man" and genera like "animal," are universals that are "said-of" primary substances, meaning they are predicated essentially of them without inhering as accidents. Accidents, such as qualities or quantities, are "present-in" subjects but not said-of them, further delineating how universals operate within the categorical framework. This immanent conception of universals underpins Aristotle's syllogistic logic, where universal premises enable from general truths grounded in sensible . In the , syllogisms rely on universals like "" to draw necessary conclusions, with these premises derived inductively from observed particulars to ensure their reliability. By anchoring universals in the sensible world, 's system circumvents , as knowledge builds from concrete instances rather than abstract separations, providing a stable basis for scientific demonstration.

Medieval Debates and Scholasticism

Boethius's Translation and Influence

Anicius Manlius Severinus (c. 480–524 CE), a Roman philosopher and statesman, played a pivotal role in reintroducing the problem of universals to the Latin West through his translations and commentaries on key ancient texts. He translated Porphyry's , an introduction to Aristotle's Categories, into Latin, along with Aristotle's logical works including the Categories, , and . In his second commentary on the Isagoge, explicitly posed Porphyry's questions about whether genera and species exist as substances, quantities, or qualities, and whether they are corporeal or incorporeal, thereby framing the problem of universals for medieval Latin readers who lacked direct access to originals. Boethius did not adopt a moderate realist position but argued against the existence of real universals as substances common to many, suggesting they cannot be one being (due to distinct acts of being) or many beings (leading to regress). He held that genera and subsist incorporeally in sensibles but are understood universally in the mind through , incorporating Neoplatonic ideas of divine exemplars while leaving the core questions somewhat open. This approach influenced later scholastic debates by blending Aristotelian with Platonic divine ideas, without affirming universals' independent reality in things. Boethius's works preserved essential ancient philosophical texts amid the decline of the , ensuring their survival and transmission through the early medieval period. His logical translations and commentaries became foundational in monastic schools, laying the groundwork for the under , where they influenced renewed interest in and metaphysics. In his Consolation of Philosophy, Boethius indirectly engages themes related to universals through discussions of and fate, portraying as the divine rational order (analogous to universals ante rem) that encompasses all in an eternal, unified plan. This work, written during his imprisonment, underscores how divine foreknowledge unifies the multiplicity of created things without negating their individuality, echoing his broader metaphysical synthesis.

Realism in Anselm and Aquinas

(1033–1109) developed a realist account of universals rooted in divine , positing them as real essences existing primarily in 's mind as creative ideas or exemplars. In his Monologion, Anselm argues that universals, such as the form of goodness, function as transcendent Platonic-like entities that ground the commonality observed in particular things, enabling rational discourse about genera and species. He structures reality across three levels: universals exist most fully at the first level (R-1) in 's mind, where they possess complete being; at the second level (R-2), they appear as imitations with diminished reality in created particulars; and at the third level (R-3), they are grasped as concepts in human minds. This allows universals to be essentially identical across instances while differing in existential degree, thus supporting true predication—such as calling multiple things "good"—without reducing them to mere names. Anselm's argument begins with the observation that diverse goods share a common nature, requiring a single, supreme, category-neutral form of goodness that exists independently and serves as their cause, ultimately identified with . Building on this Augustinian-Platonic inheritance, which Anselm adapts from Boethius's framework of divine ideas, his realism emphasizes that universals are necessary for scientific knowledge and linguistic universality, as they provide the objective basis for attributing properties to classes of beings. Without such real essences in God, Anselm contends, the imitation and resemblance among particulars—essential for speech about shared kinds—would lack foundation, rendering metaphysics incoherent. This position defends realism against emerging nominalist tendencies by insisting that universals' reality in the divine intellect ensures their causal role in creation, where particulars participate in them without compromising divine simplicity. Thomas Aquinas (1225–1274) advanced a in his , synthesizing Aristotelian with to argue that universals exist in three modes: ante rem as divine ideas in God's mind, in re as common natures inherent in particular things, and post rem as abstracted concepts in the human intellect. Unlike extreme , Aquinas denies that universals exist as independent entities separate from particulars; instead, they are abstracted by the intellect from sensible individuals, stripping away individuating conditions like determinate matter to reveal the shared essence. For instance, the universal "humanity" exists in re within individual humans as their substantial form, not multiplied or divided among them, but one in essence though numerically distinct in existence due to the principle of individuation. This aligns closely with Aristotle's categories, where universals inhere in substances as formal causes, enabling scientific demonstration through necessary predications about kinds. Aquinas further distinguishes essence from existence to explain universals' status: are common natures considered absolutely, neither universal nor particular in themselves, but they become universal only in the mind's , while existing in re as participated by without numerical unity across them. In , these universals exist ante rem as exemplary ideas that serve as the eternal archetypes for , ensuring and intelligibility without implying multiplicity in the divine . This moderate approach supports realism's core claim that universals are indispensable for true , as from sensibles yields concepts that correspond to real commonalities in things, facilitating syllogistic reasoning and theological synthesis. Arguments for this position highlight that without universals in re, predication of properties to multiple subjects would be impossible, and divine ideas as exemplars ground the world's rational structure.

Nominalism in Abelard and Ockham

Peter (1079–1142), a prominent medieval philosopher, advanced an early form of , often characterized as , in response to the realist theories of his contemporaries. In his Logica Ingredientibus, Abelard argued that universals are not real entities but rather linguistic expressions—specifically, words (vox) or significant terms (sermo)—that signify commonalities among particulars without positing any shared metaphysical essence. For Abelard, a universal term like "" applies distributively to individuals such as and by denoting their common status or condition, rather than referring to an independent form or substance. This view emphasizes the semantic role of in , where the mind forms concepts from sensory experience of particulars, avoiding the ontological commitment to extra-mental universals. Abelard's position rejected by highlighting its logical incoherencies, such as the impossibility of a single being wholly present in multiple distinct individuals without —for instance, the "animal" could not simultaneously embody in humans and in donkeys. He critiqued for failing to account for and indifference for absurdly equating individuals with universals, arguing that similarity arises from in , not from an underlying common nature. This semantic approach shifted the debate toward how words and concepts function, paving the way for later nominalist developments. William of Ockham (c. 1287–1347) radicalized , denying the existence of universals altogether and insisting that only individual substances and qualities are real. Applying his famous principle of parsimony—known as Ockham's Razor, which advises against multiplying entities beyond necessity—Ockham rejected universals as superfluous metaphysical posits unsupported by reason, experience, or scripture. For Ockham, terms like "" or "" are merely mental concepts or spoken words that signify resemblances among individuals, with no corresponding real universal entity; resemblances themselves are explained through direct comparison of shared qualities in particulars or, ultimately, by God's arbitrary will in creation. Ockham's arguments against underscored the unnecessary proliferation of entities it entailed, such as positing a that would itself need to be hot, leading to absurd regresses or contradictions in predication. He further contended that assuming real implies absurd consequences, like the annihilation of one individual destroying the universal and thus affecting all others, which undermines God's . These critiques supported an , where knowledge derives from intuitive cognition of singulars, and a voluntarist , emphasizing divine will over fixed natures. The of Abelard and Ockham sparked the via moderna in late medieval , influencing theological and philosophical currents that emphasized empirical and linguistic analysis over essentialist metaphysics. Ockham's ideas, in particular, contributed to the by promoting and critiques of ecclesiastical authority, as seen in thinkers like , and laid groundwork for modern science through the Razor's advocacy of simplicity and rejection of abstract entities in favor of observable particulars.

Modern and Contemporary Developments

Idealist and Empiricist Responses

(1632–1704), in his empiricist framework, advanced regarding universals, viewing them as abstract general ideas created by the mind through from particular sensory experiences, existing only in the intellect without independent ontological status. In (1689), Book III, Locke argues that words signify these general ideas, which represent classes of particulars sharing resemblances, such as the idea of "" abstracted from specific triangles: "The mind makes the particular ideas received from particular objects to become general representations of all of the same kind." This approach rejects both realism's separate entities and extreme nominalism's mere names, grounding universals in psychological processes while enabling classification and communication, though Locke acknowledges challenges in precisely forming such abstracts without resembling any particular instance. Immanuel Kant (1724–1804) addressed the problem through , positing that universals are not derived solely from experience but as a priori categories of the understanding that structure sensory data, making objective knowledge possible. In (1781), Kant derives twelve categories (e.g., substance, ) from the logical forms of judgment, arguing they are universal conditions of human cognition imposed on phenomena, while things-in-themselves (noumena) remain unknowable: "The pure concepts of understanding... are not derived from experience, but are instead the categories through which experience becomes possible." This resolves the "one-over-many" by making universals mind-dependent yet necessary for unifying particulars in synthetic judgments, critiquing both empiricist induction and rationalist . In the modern development of the problem of universals, (1770–1831) advanced a dialectical idealist approach, positing universals not as abstract entities detached from particulars but as "concrete universals" that emerge through the dynamic synthesis of individualities within the unfolding of (spirit). In his Phenomenology of Spirit (1807), Hegel describes this process as the historical and logical mediation where particulars are sublated—negated yet preserved—in higher unities, realizing universality in concrete totality rather than static isolation. For Hegel, represents the absolute spirit manifesting through and consciousness, wherein universals gain actuality by integrating differences into a self-developing whole, as seen in the progression from sensory certainty to absolute knowing. Hegel critiqued both traditional and for their handling of abstract universals: realism treats them as unchanging forms beyond experience, rendering them inert and disconnected from the world's flux, while nominalism fragments into disconnected without genuine , leading to subjective arbitrariness. Instead, Hegel's concrete universals overcome this by embodying , where the universal is immanent in particulars and actualized through dialectical and , as in the master-slave dialectic where individual achieves universal recognition. This view synthesizes Aristotelian with a post-Kantian emphasis on mind-dependence, positioning universals as essential to the rational structure of . In contrast, (1806–1873) offered an empiricist nominalist response, denying any real existence to universals beyond observable resemblances among particulars, treating them instead as linguistic tools for derived inductively from sensory . In (1843), Mill argues that general names like "man" or "white" denote classes formed by shared attributes discerned through repeated observations, with no to separate entities: "A class, or... a universal... is not an entity per se, but... the individual substances themselves." This approach relies on , where ideas of universals arise from the mental association of similar sensations—such as linking various white objects through contiguity and resemblance—enabling practical and inference without metaphysical posits. Mill's framework thus grounds universals in empirical , positing that "resemblance is evidently a feeling; a state of the of the observer," which facilitates inductive from to classes, as in forming the of "" from observed instances sharing ductility and yellowness. By reducing universals to names for these experiential uniformities, Mill avoids the idealist elevation of mind while providing a mechanism for scientific reasoning rooted in and habit.

Pragmatist and Analytic Critiques

(1839–1914) revived scholastic realism within a pragmatic framework, viewing universals not as abstract entities but as real generals manifesting as possibilities, laws, and habits of action. He categorized reality into Firstness (qualities and possibilities), Secondness (actual reactions), and Thirdness (laws and mediations), where universals align with Thirdness as objective generals that govern future contingencies and enable prediction through scientific inquiry. For Peirce, the reality of universals is tested pragmatically: their existence is confirmed by the practical effects they produce in inquiry and action, such as recurring patterns in experimentation that guide habits and resolve doubts. This approach rejects nominalism's reduction of universals to mere names, instead positing them as dynamically real elements essential to the continuity of experience and the growth of knowledge. William James (1842–1910), building on , critiqued traditional views of universals by treating them as conceptual tools derived from the flux of pure experience rather than fixed metaphysical substances. In his philosophy, the —a continuous, interpenetrating flow of sensations and thoughts—dissolves rigid categories, rendering universals as abstractions that emerge pragmatically to organize and economize thought for practical purposes. Concepts function as parts of experience that represent other parts, facilitating transitions like from an idea of "dog" to actual perceptions, but their validity lies in their utility within the ongoing stream, not in correspondence to independent realities. thus prioritizes conjunctive relations experienced directly in the flux, viewing universals as functional aids for action and prediction, aligned with pragmatism's emphasis on consequences over abstract necessity. In the analytic tradition, (1908–2000) advanced ontological relativity, arguing that commitments to universals arise not from metaphysical intuition but from the regimentation of into logical frameworks, blurring any sharp divide between universals and . In works like , Quine posits that ontological questions, including the existence of universals such as redness or numbers, are relative to a conceptual scheme: what a commits to are the values of its bound variables, determined by how language is formalized to achieve theoretical simplicity and empirical adequacy. He rejects platonistic of universals as unnecessary, suggesting they can be reconstrued as classes abstracted from via identification of indiscernibles, with no absolute criterion distinguishing abstract from concrete entities beyond linguistic convenience. This dissolves the classical problem by tying to the holistic of by data, where universals serve explanatory roles only insofar as they integrate into a web of beliefs.

Recent Realist and Structuralist Views

In the late 20th century, David Armstrong advanced a form of immanent realism, positing that universals exist as real entities inherent in the world's states of affairs, rather than as transcendent forms separate from particulars. According to Armstrong, universals are non-spatiotemporal qualities or relations that are instantiated directly in particular objects, thereby avoiding both Platonic separation and nominalist denial of shared properties. This view, detailed in his Universals: An Opinionated Introduction (1989), resolves the problem of resemblance by appealing to "exact similarity" grounded in the identity of shared universals, such that two particulars resemble each other precisely because they partake in the same universal. Armstrong's realism is empirically informed, drawing on scientific practices where laws of nature presuppose universals as the basis for repeatable properties. A key element of Armstrong's critique targeted resemblance nominalism, which attempts to explain similarity among through primitive resemblance without universals. He argued that this approach incurs a vicious : if two particulars resemble each other via a resemblance relation, that relation itself must resemble other instances of resemblance, requiring further resemblances , without grounding the initial similarity. This regress undermines the nominalist's explanatory goal, as it fails to account for exact matches in properties like mass or charge without positing universals. Armstrong's argument, first elaborated in Nominalism and Realism (1978), has influenced ongoing analytic metaphysics by highlighting the parsimony of immanent over purely relational accounts. Nino Cocchiarella offered a formal semantic approach to universals through and , treating them as higher-order predicates that capture the predicative structure of language and thought. In Logical Investigations of Predication Theory and the Problem of Universals (1986), he developed a conceptual realist framework where universals are abstract entities reconciled with nominalist intuitions via typed higher-order logics, allowing predicates to denote intensions rather than mere extensions. This avoids reducing universals to linguistic conventions while accommodating formal semantics. Cocchiarella critiqued Quinean extensionalism, which demands that ontology commit only to extensional entities like sets, by showing that such a view distorts the predicative nature of universals and ignores the intensional commitments of and . His work demonstrates how enables a non-extensional that supports without ontological excess. Roger Penrose extended structuralist perspectives on universals into the , viewing them as timeless mathematical structures inhabiting a realm independent of physical instantiation. In (2004), Penrose argues that the laws of and rely on such structures—abstract forms like geometric symmetries or fields—as the fundamental universals governing reality, bridging mathematics and empirical science. This structural realism posits that universals are not properties of particulars per se but relational patterns in the mathematical description of the , offering a modern suited to . Contemporary debates continue to engage these views, with Armstrong's regress argument challenging nominalist alternatives and Cocchiarella's intensional framework countering extensional reductions, while Penrose's inspires discussions on the of scientific laws.

Perspectives in Indian Philosophy

Realist Schools: Nyāya-Vaiśeṣika and Mīmāṃsā

In the schools, dating from around the 2nd century BCE, universals ( or sāmānya) are treated as distinct padārthas, or categories of reality, alongside substances, qualities, actions, particulars, and inherence. These universals are conceived as , partless entities that are omnipresent within their instances, inhering in particulars through the relation of samavāya, an inseparable and connection that binds the universal to its substrata without being reducible to mere conjunction. For instance, cowness (gotva) inheres in every individual cow, enabling the recognition of shared properties across diverse particulars while preserving their individuality. This is systematically outlined in the Vaiśeṣika Sūtras of , particularly in sections such as 1.2.3–6 and 7.2.26, where universals like substanceness (dravyatva) and existence (sattā) are described as genera pervading all relevant categories. The Nyāya-Vaiśeṣika realism posits that universals are necessary for coherent , , and linguistic function. Without them, the apprehension of similarities across objects would be impossible, leading to the failure of arthavyavahāra, or practical verbal transactions, as words (śabda) denote universals to convey meaning effectively. Gautama's , in 1.1.3 and 1.1.23–25, emphasize verbal testimony (śabda-pramāṇa) as a means of valid that relies on universals to cognize , such as common characters (sāmānya-dharma) that resolve doubt and enable inference-based ; for example, the universal "productness" links diverse artifacts in linguistic and cognitive judgments. This argument underscores that denying universals would collapse language into mere nominal labels, rendering cognition of shared essences untenable and disrupting everyday verbal communication. The school, originating around the 3rd century BCE with Jaimini's Mīmāṃsā Sūtras, adopts a ritual-oriented where universals (sāmānya) are real entities essential for the efficacy of Vedic injunctions and the realization of . Here, universals function as generic properties that unify ritual elements, ensuring that Vedic prescriptions—such as those governing sacrifices—produce the intended cosmic results by linking particulars to eternal norms. This view integrates universals into , where they enable the interpretation of scripture as authoritative commands, with sāmānya providing the basis for general rules of that transcend individual actions. The Mīmāṃsā Sūtras, across its 2,700 aphorisms in 12 chapters, affirm this by treating universals as objective realities that validate the Veda's apauruṣeya (authorless) status and ritual potency.

Nominalist Approaches in Buddhism

Buddhist philosophy, originating around the 5th century BCE, fundamentally rejects the existence of svabhāva (inherent essence) in all phenomena, viewing universals not as independent realities but as prajñapti (nominal designations or conceptual imputations) applied to particulars. This perspective is rooted in the doctrine of dependent origination (pratītyasamutpāda), which explains that all entities arise interdependently through causes and conditions, lacking any autonomous or essential nature that could ground real universals. In the school, developed by Nāgārjuna (c. 150–250 CE), the doctrine of () provides a rigorous basis for denying the reality of universals. Nāgārjuna argues in his that all dharmas (phenomena) are devoid of svabhāva, rendering any supposed shared properties or universals as illusory resemblances without inherent existence. here is not but the recognition that phenomena dependently originate and lack independent essence, thus undermining essentialist claims about universals as eternal or substantial entities. The tradition, advanced by (c. 4th–5th century CE), further elaborates this through a mind-only (cittamātra) framework, positing universals as mere mental constructs (vikalpa) arising from discriminative . In this view, what appear as universals—such as shared qualities among objects—are fabrications of the imagined nature (parikalpita-svabhāva), projected by the defiled mind onto momentary particulars without any external, objective counterpart. thus aligns with by reducing universals to dependent mental imputations, emphasizing their role in perpetuating delusion rather than reflecting true reality. Buddhist nominalist approaches argue that accepting real universals would commit one to eternalism (śāśvatavāda), positing unchanging essences that contradict the doctrines of impermanence (anicca) and no-self (anātman). Through pratītyasamutpāda, Buddhists demonstrate that all phenomena, including any purported universals, arise conditionally and lack intrinsic identity, thereby critiquing realist ontologies like Nyāya by showing that universals cannot inhere eternally but must be nominally designated for conventional utility. This nominalism supports soteriological goals by revealing conceptual fabrications as obstacles to realizing emptiness and liberation.

Key Positions and Arguments

Realism: Arguments and Variants

posits that universals exist objectively and independently of , serving as the shared properties or qualities that multiple entities instantiate. This position contrasts with by affirming an to universals as real entities, necessary for explaining resemblance, predication, and the structure of . Variants of differ in the location and nature of these universals: ante rem , inspired by thought, holds that universals exist transcendentally prior to and independently of ; in re , following Aristotelian and contemporary immanentist views, locates universals within as their inherent constituents; and , as articulated in medieval traditions, views universals as abstracted from without separate . A central argument for is the "one over many" argument, which contends that the observed resemblance among diverse —such as the roundness shared by various spherical objects—requires a single to unify these instances, as mere cannot account for exact similarity without invoking a common property. This argument, traced to ancient sources but defended in modern terms, posits that without universals, explanations of why multiple things share the same attribute would devolve into infinite particular resemblances, lacking . David Armstrong elaborates this in his immanent realist framework, arguing that universals are the "one" that stands over the "many" to ground natural resemblances. Another key argument draws from , which requires that every truth have an ontological ground or "truthmaker" in reality. Realists like Armstrong argue that propositions about shared properties, such as "this and that are negatively charged," are made true by of negative charge, rather than by the particulars alone, which would otherwise fail to necessitate the truth across instances. This approach extends to explaining necessary connections in states of affairs, where universals serve as the repeatable components that make contingent facts obtain. The linguistic argument for emphasizes in , where terms like "" apply truly to multiple objects, implying that the corresponds to a real rather than a mere linguistic convention or mental construct. The structure of sentences involving general terms suggests an objective basis for their applicability, as would otherwise lack a unified beyond disparate . This argument supports the need for universals to underwrite the semantics of generality in natural . Realism's strengths lie in its ability to account for laws of nature and natural kinds, where universals provide the necessary regularities and essences. For instance, Armstrong argues that scientific laws, such as the law of gravitation, are grounded in relations between universals like and , enabling counterfactual support and explanatory depth that trope theories or cannot match. Similarly, natural kinds like "" are unified by the universal H₂O, allowing for inductive generalizations and essentialist predictions in science. Despite these virtues, realism faces challenges, including the "location problem," which questions where transcendent reside if not in space-time, potentially rendering them causally inert or epistemically inaccessible. Immanent variants avoid this by embedding in , but still grapple with how a single can be wholly present in multiple locations without . Additionally, the third-man poses an risk: if resemble a , that resemblance requires another higher-order , and so on, unless resemblance itself is —a move some accept but others see as ad hoc. In , second-order realism refines the view by treating universals as higher-order properties applying to first-order properties, avoiding direct by while preserving ontological economy. This approach, developed by thinkers like Fraser MacBride, counters theory by arguing that tropes (particularized properties) require second-order universals to explain their exact resemblances, thus reinstating universals without the regress of lower-level theories.

Nominalism: Arguments and Variants

Nominalism denies the existence of , maintaining that only concrete particulars populate the world and that general terms refer merely to collections or resemblances among them. The core argument for this position invokes ontological parsimony, famously articulated through Ockham's Razor: "Entities should not be multiplied beyond necessity." Since are posited to account for similarities among particulars but are not required for empirical or linguistic function—similarity can instead be grasped through direct intuitive of individuals—postulating them unnecessarily complicates . In medieval formulations, this parsimony extends to theological grounds, where might constrain divine by implying necessary shared natures, whereas allows God to arrange particulars arbitrarily to produce observed similarities. Several variants of elaborate how to explain predication and similarity without universals. Resemblance nominalism posits that a possesses a F (such as redness) it resembles all and only other F- in a , unanalyzable of qualitative similarity; universals are thus reduced to facts about resemblance classes across actual and possible worlds. This approach avoids abstract entities by grounding classification in observable likenesses, but it faces the regress problem: if resemblance is itself a requiring explanation, what (or further relation) accounts for why certain resemble each other, leading to an infinite hierarchy? Trope nominalism, another variant, replaces universals with tropes—particularized, non-transferable property instances, such as the specific redness of this apple, which are concrete entities bundled into objects via compresence relations. are thus not shared but exactly alike across tropes, allowing similarity without ; for example, two red objects resemble because their distinct red tropes are qualitatively . This preserves the particularity of all entities while explaining predication through trope aggregation, yielding a parsimonious confined to spatiotemporal and their exact duplicates. However, it encounters the problem: absent a , what determines why similar tropes (e.g., multiple rednesses) converge to form a single coherent object rather than disparate ones? Set nominalism, or class nominalism, treats apparent universals as mere sets or of resembling ; the "," for instance, is identical to the comprising all red things, with membership providing the metaphysical basis for shared qualities. This variant leverages extensional to explain generality without additional , as classes are abstracta derived solely from particulars. A key weakness arises in accounting for the invariance of across such classes: without second-order universals, nominalists struggle to define stable criteria for set members, risking ontological overcommitment to ungrounded resemblances. The strengths of nominalism lie in its avoidance of mysterious abstracta, promoting a concrete, empirically tractable metaphysics that aligns with scientific practice by focusing on observable particulars. From Ockham's rejection of real universals as superfluous mental constructs to Quine's modern "ostrich nominalism"—which dismisses the problem of universals as a pseudo-issue resolvable through linguistic predicates without property commitments—the tradition emphasizes strict ontological economy over explanatory depth. Contemporary forms distinguish strict variants (denying all property-like entities) from ostension-based ones (relying on demonstrative pointing to similarities), though both prioritize amid ongoing realist critiques of explanatory inadequacy.

Conceptualism and Moderate Alternatives

Conceptualism posits that universals exist not as independent entities in reality but as mental concepts or representations formed by the mind to categorize and understand particulars. In this view, universals are post rem, meaning they arise after experience with individual things, serving as tools for rather than objective features of the world. articulates this position in his Essay Concerning Human Understanding, arguing that abstract ideas, such as the concept of "triangle," are derived from sensory particulars through , allowing the mind to generalize without positing real universals beyond thought. Similarly, 's treats universals as categories of understanding imposed by the mind on sensory intuitions, enabling synthetic judgments while avoiding the excesses of by grounding them in subjective rather than extra-mental existence. This approach balances the extremes of nominalism and realism by acknowledging the reality of universals within the cognitive realm, thus explaining abstraction and predication without introducing superfluous ontological commitments. Conceptualism resolves the "one over many" problem by locating universality in mental acts that unify similar particulars under a single concept, facilitating knowledge and language use. George Berkeley extends conceptualism into a more radical idealistic variant in his A Treatise Concerning the Principles of Human Knowledge, rejecting abstract general ideas altogether and maintaining that all ideas are particular, with universality emerging solely from the mind's notional comprehension under divine order. Critics argue that conceptualism's mind-dependence undermines intersubjectivity, as differing minds might form incompatible concepts for the same phenomena, potentially eroding shared knowledge. Moreover, it fails to fully address the one-over-many issue, since mental concepts alone do not explain why particulars resemble each other independently of observation. Among moderate alternatives, moderate realism, as developed by Thomas Aquinas, compromises by asserting that universals exist in re—in things themselves as common natures—but only become universal through intellectual abstraction, avoiding both Platonic separation and nominalist reduction. In the Summa Theologica, Aquinas explains that essence is the basis for universality, present in individuals yet abstracted by the agent intellect to form species. This view preserves the explanatory power of realism while aligning with empirical experience. Structuralism in metaphysics views universals as relations within structural configurations, where properties are defined by their positions in relational networks rather than inherent essences. In this framework, the universality of, say, "redness" emerges from structural roles linking particular instances, as explored in analyses of complex universals that avoid infinite regress by treating structures as mereological sums. Predicativism presents universals as linguistic or logical roles in predication, where terms function to attribute properties without committing to their independent existence. This moderate stance emphasizes that universality is a feature of how predicates operate in sentences, bridging nominalist parsimony and realist explanatory needs by focusing on semantic function over ontology.

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