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Babak S.
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 Sep10 answered Find a vector parallel to the intersection of the planes $2x-3y+5z=2$ and $4x+y-3z=7$ Sep10 revised Find a vector parallel to the intersection of the planes $2x-3y+5z=2$ and $4x+y-3z=7$ edited tags Sep9 comment If $G$ is a finite group whose $p$-Sylow subgroup $P$ lies in its center, then there is a normal subgroup $N$ of $G$ with $P\cap N=\{e\}$ and $PN=G$ This is Burnside transfer theorem I think. Sep9 revised If $G$ is a finite group whose $p$-Sylow subgroup $P$ lies in its center, then there is a normal subgroup $N$ of $G$ with $P\cap N=\{e\}$ and $PN=G$ edited tags Sep9 answered Is there a simple group of order $105$? Sep9 revised Is there a simple group of order $105$? edited tags Sep9 revised Find convergence of series … added 16 characters in body Sep8 awarded Enlightened Sep8 awarded Nice Answer Sep7 revised Is this series divergent or convergent? added 14 characters in body Sep7 revised Is this series divergent or convergent? added 8 characters in body; edited tags Sep7 comment Integrating $d\psi=(x+y)dx +x_0dy$ y+(1+y/x)=0 you mean? Sep7 revised When an Abelian group is cyclic edited tags Sep7 comment Is there a composite integer $n \geq 9$ such that $n \nmid (n-1)!$? @Comeseeconquer: From 9 to 10^5, there is no such that number. I examined it. So we have to prove it probably. Sep7 answered Cauchy problem, differential equation Sep7 revised Does there exist a non-abelian group with roots? added 3 characters in body Sep7 comment How to Integrate $\int\frac{(x^2)}{\sqrt{7-x^2}}dx$. I know another substitution. Would u like to know it? :) Sep7 revised Greatest common divisor problem involving $a^p+b^p$ added 9 characters in body Sep7 answered Proof an inequality by mathematical induction Sep7 revised Calculating number of elements commmuting with $\sigma\in S_{10}$ edited tags