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Apr
25
answered Non-Cayley expander graphs
Apr
20
comment How to estimate a specific infinite matrix sum
@AmirSagiv: I added the definition of $p_n$.
Apr
20
revised How to estimate a specific infinite matrix sum
Added more information
Apr
19
revised How to estimate a specific infinite matrix sum
added a new sentence
Apr
19
revised How to estimate a specific infinite matrix sum
Extended one formula
Apr
19
answered How to estimate a specific infinite matrix sum
Apr
19
revised What are the eigenvalues of a square matrix added to a diagonal matrix with different diagonal elements?
Symbols edited
Apr
19
suggested approved edit on What are the eigenvalues of a square matrix added to a diagonal matrix with different diagonal elements?
Apr
18
comment Properties of a special finitely presented groups
@DerekHolt: Thanks. Now, I am enjoying of learning HNN extension. Sometimes, by asking, you can find some jewels.
Apr
17
accepted Properties of a special finitely presented groups
Apr
17
comment Properties of a special finitely presented groups
Dear HJRW, I saw it after some search in google. But, would you please introduce me some good reference about the proof of this fact and some related similar theorems?
Apr
17
comment Properties of a special finitely presented groups
Dear Holt, I can not see why it is torsion free? Would you please say some more details?
Apr
17
comment Properties of a special finitely presented groups
Thanks for the introducing HNN extensions. It seems interesting, as I was not familiar with this topic.
Apr
17
comment Properties of a special finitely presented groups
Thanks dear Kohl, is there any method such that we can check in GAP that the group $G$ is orderable?
Apr
17
asked Properties of a special finitely presented groups
Apr
16
comment How many triangles can a connected graph with $n$ vertices and $m$ edges have?
The paper seems interesting. It has some trivial results, but one up vote for the very nice style of writing.
Apr
14
revised An algebraic graph theory problem?
Reference added
Apr
14
answered An algebraic graph theory problem?
Apr
7
comment Minimization module $p$
Meysam, if you have some numerical results, it is better to add them here for visualization.
Mar
30
comment The values of $n$ which satisfy an inequality about prime numbers
GH from MO, it is nice solution!