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). 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. 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.

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