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May
17
answered Topics in Algebra I.N.Herstein Problem 7
May
17
answered what does this notation means in group theory?
May
14
comment Showing the inverse of an open and continuous function is also open
I assume you're using the $\epsilon - \delta$ definition of continuity? Continuous functions are often defined as functions for which $f^{-1}(O)$ is open for $O$ open.
May
13
comment Proof of an equation involving Stirling numbers of the second kind
I had once asked for a combinatorial interpretation of the same equation. Grigory M provided a beautiful explanation here.
May
10
comment Canonical Mapping in Linear Algebra
It's not limited to vector spaces, which is why you may be having a difficult time searching for it. This is an instance of a more general map called the "natural projection" (sometimes also called the "canonical projection") which sends an element to it's equivalence class.
May
7
accepted Equivalence between different forms of the Axiom of Infinity
May
6
asked Equivalence between different forms of the Axiom of Infinity
May
6
awarded  Popular Question
Apr
7
awarded  Yearling
Mar
31
awarded  Guru
Feb
17
awarded  Guru
Feb
11
comment derivatives with matrices
Are you taking the derivative evaluated at $t=0$?
Feb
7
awarded  Nice Question
Jan
30
awarded  Enlightened
Jan
29
awarded  Nice Answer
Jan
24
accepted Automorphism group of a lattice's Voronoi cell
Jan
23
comment Automorphism group of a lattice's Voronoi cell
Thank you for the proof. There are a few things I would formalize a bit, but the overall direction seems great. In particular your proof is just the fact that the facet vectors of a lattice generate it, something which I should've thought of :).
Jan
21
awarded  Nice Question
Jan
19
answered Is a permutation of block diagonals similar?
Jan
19
comment Is a permutation of block diagonals similar?
Your proof and your result are both correct. Explicitly, the two are similar through the corresponding permutation matrix, which is seen as the change of basis matrix from your original basis to your permuted one.