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2d
reviewed Approve Find all functions $F(x)$ for which $F (x) + F ((x − 1)/x) = 1 + x$
2d
reviewed Approve Relationship between set topologies
Feb
5
revised Estimate from above the series: $\sum_{i=1}^n \frac{1}{(i-j)^2}$.
added 47 characters in body
Feb
5
reviewed Approve Basis for range and kernel of T and prove rank nullity theorem
Feb
5
comment Estimate from above the series: $\sum_{i=1}^n \frac{1}{(i-j)^2}$.
I mean an estimate for each value of $j$.
Feb
5
asked Estimate from above the series: $\sum_{i=1}^n \frac{1}{(i-j)^2}$.
Feb
5
accepted Prove that $\int_{0}^\pi x^{2k} \cos(h x) dx\geq 0$.
Feb
5
asked Prove that $\int_{0}^\pi x^{2k} \cos(h x) dx\geq 0$.
Feb
2
reviewed Approve Given $3$ types of coins, how many ways can one select $20$ coins so that no coin is selected more than $8$ times.
Feb
2
reviewed Approve What is the number of linearly independent solutions of a set of vectors taken from identity matrix?
Feb
2
reviewed Approve How to find sides on similar shapes (trapezia)?
Feb
2
asked Convergence of the series $\sum_{n=1}^\infty \left|\int_{-\pi}^\pi x^{2k} e^{i(n-a)x}\, dx\right|$.
Jan
28
comment Calculate (or estimate) $S(x)=\sum_{k=1}^\infty \frac{\zeta(kx)}{k!}$.
I did not know that $\zeta(z)\sim 1+\frac{1}{2^z}$ for $z\rightarrow \infty$. Could you tell me where I find the proof of this, please?
Jan
28
asked Calculate (or estimate) $S(x)=\sum_{k=1}^\infty \frac{\zeta(kx)}{k!}$.
Jan
28
reviewed Approve The degree of smooth projective curve included in $\mathbb P^n$ which is nondegenerate is more or equal the dimension of the projective space
Jan
28
reviewed Approve Probability with $2$ colored balls and one box: $1/3$ or $1/4$?
Jan
28
reviewed Reject What is the equation of a pyramid with a square base?
Jan
24
asked Estimate $S_n=\sum_{j=1}^n \frac{1}{\cos q_j}$.
Jan
19
reviewed Approve Proof with fields.
Jan
19
reviewed Approve Proof with fields.