I have trouble in showing a disk and a square is not diffeomorphic.(adsbygoogle = window.adsbygoogle || []).push({});

Intuitively, I know there is smoothness problem occurs at the corner of the square if I suppose there is a diffeomorphism between the two, but how can I explicitly write down the proof? I hope someone can provide me with some hints. Thx!

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# Diffeomorphism of a disk and a square?

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