Pluralism is a term used in philosophy, meaning "doctrine of multiplicity", often used in opposition to monism ("doctrine of unity") and dualism ("doctrine of duality"). The term has different meanings in metaphysics, ontology, epistemology and logic.
In metaphysics, pluralism is a doctrine that there is more than one reality, while realism holds that there is but one reality, that may have single objective ontology or plural ontology. In one form, it is a doctrine that many substances exist, in contrast with monism which holds existence to be a single substance, often either matter (materialism) or mind (idealism), and dualism believes two substances, such as matter and mind, to be necessary.
In ontology, pluralism refers to different ways, kinds, or modes of being. For example, a topic in ontological pluralism is the comparison of the modes of existence of things like 'humans' and 'cars' with things like 'numbers' and some other concepts as they are used in science.
In epistemology, pluralism is the position that there is not one consistent means of approaching truths about the world, but rather many. Often this is associated with pragmatism, or conceptual, contextual, or cultural relativism.
In logic, pluralism is the view that there is no one correct logic, or alternatively, that there is more than one correct logic. One may, for instance, believe that classical logic is the correct logic generally, but believe that paraconsistent logic is the correct logic for dealing with certain paradoxes. However, there are different versions of logical pluralism depending on what one believes 'logic' to be and what it means for a logical system to be 'correct'.
Metaphysical pluralism in philosophy is the multiplicity of metaphysical models of the structure and content of reality, both as it appears and as logic dictates that it might be, as is exhibited by the four related models in Plato's Republic and as developed in the contrast between phenomenalism and physicalism. Pluralism is in contrast to the concept of monism in metaphysics, while dualism is a limited form, a pluralism of exactly two models, structures, elements, or concepts. A distinction is made between the metaphysical identification of realms of reality and the more restricted sub-fields of ontological pluralism (that examines what exists in each of these realms) and epistemological pluralism (that deals with the methodology for establishing knowledge about these realms).
In Greece, Empedocles wrote that they were fire, air, water and earth, although he used the word "root" rather than "element" (στοιχεῖον; stoicheion), which appeared later in Plato. From the association (φιλία; philia) and separation (νεῖκος; neikos) of these indestructible and unchangeable root elements, all things came to be in a fullness (πλήρωμα; pleroma) of ratio (λόγος; logos) and proportion (ἀνάλογος; analogos).
Aristotle incorporated these elements, but his substance pluralism was not material in essence. His hylomorphic theory allowed him to maintain a reduced set of basic material elements as per the Milesians, while answering for the ever-changing flux of Heraclitus and the unchanging unity of Parmenides. In his Physics, due to the continuum of Zeno's paradoxes, as well as both logical and empirical considerations for natural science, he presented numerous arguments against the atomism of Leucippus and Democritus, who posited a basic duality of void and atoms. The atoms were an infinite variety of irreducibles, of all shapes and sizes, which randomly collide and mechanically hook together in the void, thus providing a reductive account of changeable figure, order and position as aggregates of the unchangeable atoms.
The topic of ontological pluralism discusses different ways, kinds, or modes of being. Recent attention in ontological pluralism is due to the work of Kris McDaniel, who defends ontological pluralism in a number of papers. The name for the doctrine is due to Jason Turner, who, following McDaniel, suggests that "In contemporary guise, it is the doctrine that a logically perspicuous description of reality will use multiple quantifiers which cannot be thought of as ranging over a single domain." "There are numbers, fictional characters, impossible things, and holes. But, we don’t think these things all exist in the same sense as cars and human beings."
It is common to refer to a film, novel or otherwise fictitious or virtual narrative as not being 'real'. Thus, the characters in the film or novel are not real, where the 'real world' is the everyday world in which we live. However, some authors may argue that fiction informs our concept of reality, and so has some kind of reality.
Ludwig Wittgenstein's notion of language-games argues that there is no overarching, single, fundamental ontology, but only a patchwork of overlapping interconnected ontologies ineluctably leading from one to another. For example, Wittgenstein discusses 'number' as technical vocabulary and in more general usage:
"“All right: the concept of 'number' is defined for you as the logical sum of these individual interrelated concepts: cardinal numbers, rational numbers, real numbers etc.;” ... — it need not be so. For I can give the concept 'number' rigid limits in this way, that is, use the word 'number' for a rigidly limited concept, but I can also use it so that the extension of the concept is not closed by a frontier. ...Can you give the boundary? No. You can draw one..."— Ludwig Wittgenstein, excerpt from §68 in Philosophical Investigations
Wittgenstein suggests that it is not possible to identify a single concept underlying all versions of 'number', but that there are many interconnected meanings that transition one to another; vocabulary need not be restricted to technical meanings to be useful, and indeed technical meanings are 'exact' only within some proscribed context:
Eklund has argued that Wittgenstein's conception includes as a special case the technically constructed, largely autonomous, forms of language or linguistic frameworks of Carnap and Carnapian ontological pluralism. He places Carnap's ontological pluralism in the context of other philosophers, such as Eli Hirsch and Hilary Putnam
Epistemological pluralism is a term used in philosophy and in other fields of study to refer to different ways of knowing things, different epistemological methodologies for attaining a full description of a particular field. In the philosophy of science epistemological pluralism arose in opposition to reductionism to express the contrary view that at least some natural phenomena cannot be fully explained by a single theory or fully investigated using a single approach.
Logical pluralism can be defined a number of ways: the position that there is more than one correct account of logical consequence (or no single, 'correct' account at all), that there is more than once correct set of logical constants or even that the 'correct' logic depends on the relevant logical questions under consideration (a sort of logical instrumentalism). Pluralism about logical consequence says that because different logical systems have different logical consequence relations, there is therefore more than one correct logic. For example, classical logic holds that the argument from explosion is a valid argument, but in Graham Priest's paraconsistent logic - LP, the 'Logic of Paradox' - it is an invalid argument. However, logical monists may respond that a plurality of logical theories does not mean that no single one of the theories is the correct one. After all, there are and have been a multitude of theories in physics, but that hasn't been taken to mean that all of them are correct.
Pluralists of the instrumentalist sort hold if a logic can be correct at all, it based on its ability to answer the logical questions under consideration. If one wants to understand vague propositions, one may need a many-valued logic. Or if one wants to know what the truth-value of the Liar Paradox is, a dialetheic paraconsistent logic may be required. Rudolf Carnap held to a version of logical pluralism:
"“In logic there are no morals. Everyone is at liberty to build his own logic, i.e. his own language, as he wishes. All that is required of him is that, if he wishes to discuss it, he must state his methods clearly, and give syntactical rules instead of philosophical arguments. "— Rudolph Carnap, excerpt from §17 in The Logical Syntax of Language
- Joshua Spencer (November 12, 2012). "Ways of being". Philosophy Compass. 7 (12): 910–918. doi:10.1111/j.1747-9991.2012.00527.x.
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Belief that reality ultimately includes many different kinds of things.
- Plato, Republic, Book 6 (509D–513E)
- D. W. Hamlyn (1984). "Simple substances: Monism and pluralism". Metaphysics. Cambridge University Press. pp. 109 ff. ISBN 0521286905.
- Wayne P. Pomerleau (February 11, 2011). "Subsection Realms of reality in article on William James". Internet Encyclopedia of Philosophy.
- Diels –Kranz, Simplicius Physics, frag. B-17
- Plato, Timaeus, 48 b - c
- Aristotle, Metaphysics, I , 4, 985
- Jason Turner (April 2012). "Logic and ontological pluralism". Journal of Philosophical Logic. 41 (2): 419–448. doi:10.1007/s10992-010-9167-x.
- Deborah A Prentice; Richard J Gerrig (1999). "Chapter 26: Exploring the boundary between fiction and reality". In Shelly Chaiken; Yaacov Trope. Dual-process theories in social psychology. Guilford Press. pp. 529–546. ISBN 1572304219.
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- Matti Eklund (2009). "Chapter 4: Carnap and ontological pluralism". In David J Chalmers; David Manley; Ryan Wasserman. Metametaphysics: New Essays on the Foundations of Ontology. Clarendon Press. pp. 130–156. ISBN 0199546002. On-line text found at Cornell
- Stephen H Kellert; Helen E Longino; C Kenneth Waters (2006). "Introduction: The pluralist stance". Scientific pluralism; volume XIX in Minnesota Studies in the Philosophy of Science (PDF). The University of Minnesota Press. p. vii. ISBN 978-0-8166-4763-7.
- E Brian Davies (2006). "Epistemological pluralism". Available through PhilSci Archive.
- Russell, Gillian. "Logical Pluralism". Stanford Encyclopedia of Philosophy. Stanford Encyclopedia of Philosophy. Retrieved 28 July 2016.
- Priest, Graham. "The Logic of Paradox". Journal of Philosophical Logic. Springer. Retrieved 28 July 2016.
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