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5. Theory of Logic / A. Overview of Logic / 6. Classical Logic

15326

Doubt is thrown on classical logic by the way it so easily produces the liar paradox [Horsten]

5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic

9188	Gödel proved that first-order logic is complete, and second-order logic incomplete [Gödel, by Dummett]