Shahrooz Janbaz
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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!