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Derivative
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13
A formal power series such that $f(f(x))=x$
10
A function is of bounded variation if and only if the errors of its best approximation by trigonometric polynomials satisfy $\sum\frac{e_n}n<\infty$?
9
Is there a sequence so that $\sum |a_n|=\infty$ and $\sum a_n \cos(nx)$ and $\sum a_n \sin(nx)$ converge everywhere?
9
Is there a polynomial whose cube is a symmetric polynomial?
8
Finding the asymptotic behavior of a function defined implicitly

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