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3h
answered The pushout of an epimorphism is an epimorphism
4h
answered Notation: the $\sigma$-algebra $\mathcal{F}_\tau^+$
May
22
answered Equivalence of Dirichlet problems. Gilbarg & Trudinger
May
21
answered exponent problem solving
May
21
answered Suppose $A^2B+BA^2=2ABA$.Prove that there exists a positive integer $k$ such that $(AB-BA)^k=0$.
May
11
answered 2 dimensional representations of v dimensional points based on distance
May
11
answered play with Integers
May
11
answered Property of wave equation's solutions derivatives
May
11
answered showing that 2 matrices are not similar
May
8
answered Cubic root of unity
May
8
answered Two self-adjoint operators with the same eigenvalues and eigenfunctions
May
8
answered Prove that $f^{-1} (F)$ is closed
May
8
answered Proving direct sum when field is NOT of characteristic $2$.
May
8
answered Additive closure in the set of all functions $f \in \mathcal{F}(S,\mathbb{F})$ such that $f(s)=0$ for all but a finite number of elements of $S$
May
8
answered Is there an endomorphism $F$ and a vector $v$, such that $F$-invariant $span\{v, F(v), F^2(v), …\}$ is decomposable
May
7
answered Polynomial with a prime number as a root
May
7
answered Analysis of Algorithms - Big O Notation Equivalences - Limits
May
7
answered General Formula of the $n$th Derivative for $f(x) = xe^{2x}$
May
7
answered transformation of a difference equation
May
7
answered Is this element a subset of set A?