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2d
answered Differential equation where one solution induces a set of solutions
2d
comment Sub graph of a graph up to isomorphism?
@user226045: They are. $a \def\lr{\leftrightarrow}\lr a$, $b \lr b$, $c\lr d$, $d\lr c$ is an isomorphism.
2d
reviewed Approve Determine interior and boundary of a set
2d
answered Predual of $l^1(\Gamma)$
2d
comment Application Farkas Lemma
Right. Thanks, edited-
2d
revised Application Farkas Lemma
edited body
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
comment Proof with subspaces
Another hint: $6$ (vectors in all) ${} > 5$ (dimension of $\mathbf R^5$).
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