Thursday, November 26, 2015

algebra precalculus - Does the size of the sum of squares say anything about the size of original sum?

Suppose I am told I have N numbers and that the sum of the

square of those numbers is S. Can anything be said about the sum of those
original N numbers?

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analysis - Injection, making bijection

I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...