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2d
asked Optimizing value of discrete harmonic function at a given point
Apr
24
answered Prove that for any $A \neq 0$ there is a matrix $B$ such that $A + B$ and $B$ have no eigenvalues in common.
Apr
19
answered Given $U,v,w$ find $u \in U$ that value of $||u-w|| + || v - u||$ will be minimal
Apr
18
answered Estimate the bound of the sum of the roots of $1/x+\ln x=a$ where $a>1$
Apr
17
answered When is it OK to assume something like $a \ge b \ge c$ when proving inequalities?
Apr
14
answered linear algebra (matrices) - challenging problem (determination of method/algorithm)
Apr
13
asked Denominator is product of irreducibles with cyclic Galois group
Apr
13
answered Show that $\Bbb Q(\sqrt[p]{a}, \omega )=\Bbb Q(\sqrt[p]{a}+ \omega )$
Apr
7
answered Prove that a periodic nested radical converges to the largest real root of the corresponding polynomial
Apr
7
asked Probabilities for two bombs and a businessman
Mar
27
answered If $\min(\alpha,F)$ has only one root in $E$, must $\min(p(\alpha),F)$ have only one root in $E$
Mar
26
answered How to prove that: if $q= b+d$, then $p = a+c$?
Mar
20
asked Do those iterated increment rates always yield monotonic functions?
Mar
20
asked Upper bound on finite increment rate for log
Mar
16
answered How to solve the following linearly independent vector problem?
Mar
13
answered if $f(x + y) = f(x)f(y)$ is continuous, then it has to be injective.
Mar
8
answered If $x>0$ is such that $x^{n}+\frac{1}{x^n}$ and $x^{n+1}+\frac{1}{x^{n+1}}\in \mathbb{Q} \implies x+\frac{1}{x}\in\mathbb{Q}$?
Mar
6
asked Construct $2$-paradoxical tournaments of order $n$ for $n\geq 21$
Feb
22
answered Can transposition $GL_n(k)\to GL_n(k)$ ever be realized as conjugation by some element in $S_n$?
Feb
21
answered Maximize $x^2+y^2+z^2$ subject to $x+2y+3z=4$ and $x,y,z\geq 0$