Theory of categories

thumb|Aristotle In ontology, the theory of categories concerns itself with the categories of being: the highest genera or kinds of entities. To investigate the categories of being, or simply categories, is to determine the most fundamental and the broadest classes of entities. A distinction between such categories, in making the categories or applying them, is called an ontological distinction. Various systems of classification have been proposed; these often include categories for substances, properties, relations, states of affairs, or events. A representative question within the theory of categories might be, for example, that which asks: "Are universals prior to particulars?". Quotes about A complete, luminous system of categories, so well disposed that its own law seemed to serve him as proof, and that the spirit, once it had placed itself in the admirable labyrinth, found itself there as invincibly restrained, would constitute a perfect philosophy. This science of science would have by its name true general logic. Charles Renouvier, quoted in Giovanni Amendola, La categoria. Appunti critici sullo svolgimento della dottrina delle categorie da Kant a noi, Stabilimento poligrafico emiliano, Bologna, 1913, cap. I, p. 6. See also Category theory External links Category:Philosophical concepts