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That doesn't look right, based on the Wikipedia page, it appears to be the other way around - you show that when the proposition is false, it creates a contradiction, which implies it must be true. My question is what if the definition of the proposition is incoherent/contradictory, in and of itself - like 2+2=5, or better yet, 2+2=purple.
– LightCC
Commented Dec 31, 2015 at 5:01
1

Proof by contradiction is not a fallacy.
– user2953
Commented Dec 31, 2015 at 5:50

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