Slightly relevant: you can see my answer on this thread for a proof that uses double induction (just to get you exposed to how the mechanics of a proof using double induction might work). Jan 15, 2013ย ยท Possible Duplicate: How do I convince someone that $1+1=2$ may not necessarily be true? I once read that some mathematicians provided a very length proof of $1+1=2$. Can you think. Nov 28, 2019ย ยท Please provide additional context, which ideally explains why the question is relevant to you and our community. Some forms of context include: background and motivation, relevant.

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