Friday, April 20, 2018

calculus - Question about discontinuous function with directional derivatives at a points

For a function, if at a point $a$, the function has directional derivatives along some lines, but the function is discontinuous at $a$, does that mean along those lines, the function is continuous, but along some other directions the function is not? What does the graph of such a function look like? Continuous in some direction but discontinuous in others?

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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...