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To solve a problem, I apply a lemma which is not represented in class and I lost my credit. What can I do? I attach the lemma from other book and my work in class. Someone advices me, please.
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This is the lemma and I use part 4 in my work.
This is my work, my prof's comments: "Why?" , "Why?" and the last one is "What allows you to conclude this?" I do not know how to answer them. :(
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