# Quantity and number

In Daniel D. Novotný & Lukáš Novák (eds.),

*Neo-Aristotelian Perspectives in Metaphysics*. New York, USA: Routledge. pp. 221-244 (2014)**Abstract**

Quantity is the first category that Aristotle lists after substance. It has extraordinary epistemological clarity: "2+2=4" is the model of a self-evident and universally known truth. Continuous quantities such as the ratio of circumference to diameter of a circle are as clearly known as discrete ones. The theory that mathematics was "the science of quantity" was once the leading philosophy of mathematics. The article looks at puzzles in the classification and epistemology of quantity.

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