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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 ]
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.
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, 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.
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.
[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.
Metaphysics encompasses a wide range of general and abstract topics. It investigates the nature of existence, the features all entities have in common, and their division into categories of being. An influential division is between particulars and universals. Particulars are individual unique entities, like a specific apple.