The derivative of a function is defined by f′(x)=lim provided the limit exists. For example for f(x)=\sin(x) we can prove that (see here) f^{\prime}(x)=\lim_{\Delta x \to 0}{\frac{\sin(x+\Delta x)-\sin(x)}{\Delta x}}=\cos(x) But for integration there are only a set of formulas that come from the above definition (i.e. with knowing the derivative of a function). Is there a general definition for integration like above definition (maybe an anti-limit!) that acts on a function directly?
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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...
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