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If you have any good math exercises to share feel free to contribute them on http://exwiki.org


Jan
24
accepted A question about the interlacing of symmetric matrices (graph interlacing)
Jan
23
asked A question about the interlacing of symmetric matrices (graph interlacing)
Jan
21
accepted Commuting matrices and simultaneous diagonalizability
Jan
19
comment Commuting matrices and simultaneous diagonalizability
@EricO.Korman I think what (the author) meant was the existence of an invertible matrix $T$ such that $TMT^{-1}$ l is diagonal for any $M \in G.$
Jan
19
comment Commuting matrices and simultaneous diagonalizability
@YiorgosS.Smyrlis By a group representation I mean a homomorphism from $G$ to $GL_d$
Jan
19
asked Commuting matrices and simultaneous diagonalizability
Jan
19
revised Chromatic polynomial of a grid graph
deleted 2 characters in body
Jan
19
comment Chromatic polynomial of a grid graph
@MatthewConroy Sure. I have added the full reference in the answer.
Jan
19
revised Chromatic polynomial of a grid graph
added 144 characters in body
Jan
18
comment Chromatic polynomial of a grid graph
The picture in the post suggests that the solution for general $n$ and $m$ is not known. In particular, some well known mathematicians did not know how to solve it.
Jan
18
comment Chromatic polynomial of a grid graph
What do you mean by possible solution?
Jan
18
revised Chromatic polynomial of a grid graph
deleted 4 characters in body
Jan
18
answered Chromatic polynomial of a grid graph
Dec
24
awarded  Popular Question
Dec
24
answered How to list graphs systematically?
Dec
12
awarded  Yearling
Dec
11
answered Chromatic Polynomial of Ladder Graph
Dec
9
comment Chromatic index of a graph with vertices of degree 3 and one of degree 2
See if this helps exwiki.org/mw/…
Dec
4
awarded  Popular Question
Nov
27
comment An inequality related to the number of binary strings with no fixed substring
@RossMillikan I've checked the conjecture for all $n$ up to $12$ and $|f| \leq n$ and it appears to be true.