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My professor took off 75% from my last proof and just simply put a line through it. So, now I bought Intro to Analysis by Maxwell to practice proofs. The first proof in the book is what I've tried in the attachment. I don't want to memorize Maxwell's proof but do my own, but at the same time I want to know if I'm doing things the right way.

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# Do I deserve full credit for this very simple proof?

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