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May
27
answered Application Farkas Lemma
May
26
answered The pushout of an epimorphism is an epimorphism
May
26
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
comment showing that 2 matrices are not similar
@marco11 You are right.
May
11
answered 2 dimensional representations of v dimensional points based on distance
May
11
reviewed Edit play with Integers
May
11
revised play with Integers
basic formatting
May
11
comment showing that 2 matrices are not similar
@marco11 We can. But there is now need to, when we start to compare the eigenspaces, we see that the $2$-eigenspace of $A$ is one-dimensional, while the $2$-eigenspace of $B$ is two-dimensional.
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
11
comment Can anyone help me finding recurrence relation in combinatoric?
@kuhaku As we are looking for words of length $n-1$, which are illegitimate ...
May
8
answered Cubic root of unity
May
8
answered Two self-adjoint operators with the same eigenvalues and eigenfunctions
May
8
comment Using chain rule to represent second order derivatives
So we have that $r$ depends on $x$ and $t$, right? And $\beta$?
May
8
answered Prove that $f^{-1} (F)$ is closed
May
8
answered Proving direct sum when field is NOT of characteristic $2$.