Bøger af Harold W. Noonan

This new book offers a comprehensive and accessible introduction to Fregea s remarkable philosophical work, examining the main areas of his writings and demonstrating the connections between them. Fregea s main contribution to philosophy spans philosophical logic, the theory of meaning, mathematical logic and the philosophy of mathematics.

Identity has for long been an important concept in philosophy and logic. In Book V of his Elements he first gives a useless defmition of a ratio: "A ratio is a sort of relation between two magnitudes in respect of muchness". But then, in definition 5 he answers, not the question "What is a ratio?"