Is this an issue with the law of the excluded middle, or an issue with the proof? – math.stackexchange.com

Is this an issue with the law of the excluded middle, or an issue with the proof? – math.stackexchange.com

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Part of a proof requiring you to prove that if $x^2$ is odd then $x$ is odd (given that $x \in \mathbb{N}$). It is my understanding that the contrapositive is used for this as follows. $x=2n, n \in ...

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