“Questions that pertain to the foundations of mathematics, although treated by many in recent times, still lack a satisfactory solution. Ambiguity of language is philosophy's main source of problems. That is why it is of the utmost importance to examine attentively the very words we use.”

Arithmetices principia, nova methodo exposita [The Principles of Arithmetic, presented by a new method] (1889)

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Giuseppe Peano7

Italian mathematician 1858–1932

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