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Philosophical Mathematics and the Incompleteness of Formal Systems | Ray Monk

Hidden Forces

NOTE

The Paradox of the Class of All Normal Classes

The paradox arises when considering the class of all normal classes and asking whether it is a member of itself or not. This leads to a contradiction, because if it is a member of itself, it should not be, and if it is not a member of itself, it should be. This contradiction results in a logical problem that Russell and Frager struggled to resolve, ultimately leading Frager to give up on the belief that arithmetic was really logic.

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