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In metaphysics, a universal is what particular things have in common, namely characteristics or qualities. In other words, universals are repeatable or recurrent entities that can be instantiated or exemplified by many particular things. [ 1 ]
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.
In both Universals and Scientific Realism (1978) and Universals: An Opinionated Introduction (1989), Armstrong describes the relative merits of a number of nominalist theories which appeal either to "natural classes" (a view he ascribes to Anthony Quinton), concepts, resemblance relations or predicates, and also discusses non-realist "trope ...
In metaphysics, nominalism is the view that universals and abstract objects do not actually exist other than being merely names or labels. [1] [2] There are two main versions of nominalism. One denies the existence of universals – that which can be instantiated or exemplified by many particular things (e.g., strength, humanity).
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.
[1] [2] The position maintains that universals exist both in particular objects and as concepts in the mind. [3] The "problem of universals" was an ancient problem in metaphysics about whether universals exist. For John Duns Scotus, a Franciscan philosopher, theologian and Catholic priest, universals such as "greenness" and "goodness" exist in ...
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.