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In Aristotle's view, universals are incorporeal and universal, but only exist only where they are instantiated; they exist only in things. [1] Aristotle said that a universal is identical in each of its instances. All red things are similar in that there is the same universal, redness, in each thing.
A universal may have instances, known as its particulars. For example, the type dog (or doghood) is a universal, as are the property red (or redness) and the relation betweenness (or being between). Any particular dog, red thing, or object that is between other things is not a universal, however, but is an instance of a universal.
Platonic realism (also called extreme realism" [33] [34] or exaggerated realism) [35] [36] is the view that universals or forms in this sense, are the causal explanation behind the notion of what things exactly are; (the view that universals are real entities existing independent of particulars).
In metaphysics, particulars or individuals are usually contrasted with universals. [ 1 ] [ 2 ] Universals concern features that can be exemplified by various different particulars. Particulars are often seen as concrete, spatiotemporal entities as opposed to abstract entities, such as properties or numbers.
An influential division is between particulars and universals. Particulars are individual unique entities, like a specific apple. Universals are general features that different particulars have in common, like the color red. Modal metaphysics examines what it means for something to be possible or necessary.
Nominalists deny the existence of universals altogether, even as particularised and multiplied within particulars. Moderate realism, however, is considered a midpoint between Platonic realism and nominalism as it holds that the universals are located in space and time although they do not have separate realms.
In metaphysics, a universal is a proposed type, property, or relation which can be instantiated by many different particulars. While universals are related to the concept of universality, the concept is importantly distinct; see the main page on universals for a full treatment of the topic.
The problem of universals refers to the question of whether properties exist, and if so, what they are. [26] Properties are qualities or relations or names that two or more entities have in common. [27] The various kinds of properties, such as qualities and relations, are referred to as universals.