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Forums
Mathematics
General Math
Contradiction vs contraposition
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[QUOTE="andrewkirk, post: 5846290, member: 265790"] That last formula should be ##p\wedge \neg q##. Subject to that, the two approaches are logically equivalent in classical first-order predicate logic, which is all that mathematicians that don't specialise in logic worry about. In intuitionist logic and other logics where some of the basic axioms such as ##\neg\neg p\leftrightarrow p## are not accepted, the approaches may give different results. [/QUOTE]
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Contradiction vs contraposition
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