High Quality Content by WIKIPEDIA articles! Hume's Principle, or HP—the terms were coined by George Boolos—says that the number of Fs is equal to the number of Gs if there is a one-to-one correspondence (a bijection) between the Fs and the Gs. HP can be stated formally in systems of second-order logic. Hume's Principle is named for the Scottish philosopher David Hume. HP plays a central role in Gottlob Frege's philosophy of mathematics. Frege shows that HP and suitable definitions of arithmetical notions entail all axioms of what we now call second-order arithmetic. This result is known as Frege's theorem, which is the foundation for a philosophy of mathematics known as neo-logicism.

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