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Derivative
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All Questions Answers
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question
10
A function is of bounded variation if and only if the errors of its best approximation by trigonometric polynomials satisfy $\sum\frac{e_n}n<\infty$?
Sep 22, 2022
answer
4
Solve this Diophantine equation $(2^x-1)(3^y-1)=2z^2$
May 8, 2021
question
2
Is there a continuous function with finitely many local extrema which is arbitrarily hard to approximate by (trigonometric) polynomials?
Jun 13, 2022
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13
A formal power series such that $f(f(x))=x$
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
6
Find the sum of series $ \sum_{n=1}^{\infty}\frac{1}{n^3(n+1)^3}$

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