Sunday, July 29, 2018

calculus - How to know whether an integral can be solved?

I just wonder: How do you know whether an integral can be solved? For example, exponential integral can not be derived to final result.

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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...