The book Introduction to Arithmetic (Arithmetike eisagoge) is the only extant book by Nicomachus (60–120 AD). It contains both philosophical prose and basic mathematical ideas. Nicomachus refers to Plato quite often, and writes that philosophy can only be possible if one knows enough about mathematics. Nicomachus also describes how natural numbers and basic mathematical ideas are eternal and unchanging, and in an abstract realm.
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