Math 2.0

Concept

Classical reductio ad absurdum

Summary

A stronger form of reductio ad absurdum, where instead of only deriving ¬P\neg P from showing that PP leads to a contradiction, one can also derive PP from showing that ¬P\neg P leads to a contradiction.

Further reading

  1. Wikipedia, page 76765067, revision 1368301704, Glossary of logic, section C. adopted
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