The process of abstraction required to discover the number and names of the categories has been undertaken by many philosophers since Aristotleand involves the careful inspection of each concept to ensure that there is no

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An alternative conclusion however began to be formulated in the eighteenth century by Immanuel Kant who realised that we can say nothing about Substanceexcept through the relation of the

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In the twentieth century the primacy of the division between the subjective and the objective, or between mind and matter, was disputed by, among others, Bertrand Russellan

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One of Aristotle’s early interests lay in the classification of the natural world, how for example the genus "animal" could be first divided into "two-footed animal" and then into "wingless, two-footed

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Plotinus in writing his Enneadsaround AD 250 recorded that "philosophy at a very early age investigated the number and character of the existents ... some found ten, others less .... to some the genera were the first principles, to others only a generic classification of

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In the Critique of Pure Reason (1781), Immanuel Kant argued that the categoriesare part of our own mental structure and consist of a set of a priori concepts through which we interpret

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G.W.F. Hegel in his Science of Logic(1812) attempted to provide a more comprehensive system of categories than Kant and developed a structure that was almost entirely triadic. So

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