3,697 reputation
1732
bio website sharif.academia.edu/…
location Tehran, Iran
age 25
visits member for 3 years, 2 months
seen 2 days ago

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Apr
2
answered If in a group $G$, we have $a^5 = e$ and $aba^{-1} = b^2$ for some $a$, $b$ in $G$, then what is the order of $b$?
Mar
30
reviewed Approve suggested edit on Question on computing $U_{xx}$
Mar
29
revised Linear Algebra: Suppose A is n x m, and n < m. Show that A'A is singular.
added 368 characters in body
Mar
29
answered Linear Algebra: Suppose A is n x m, and n < m. Show that A'A is singular.
Mar
29
revised proving to see that a normal subgroup is equal to a subgroup if one of the subgroup is the identity.
edited tags
Mar
29
revised proving to see that a normal subgroup is equal to a subgroup if one of the subgroup is the identity.
added 1 characters in body
Mar
29
reviewed Approve suggested edit on Probability density function help
Mar
29
comment proving to see that a normal subgroup is equal to a subgroup if one of the subgroup is the identity.
Since $H$ is a normal subgroup, you can do it
Mar
29
reviewed Approve suggested edit on First Order Logic “More Than One”?
Mar
29
comment Number of Sylow $5$-subgroups
I agree with Mark. By using GAP, it is not hard to check.
Mar
29
comment proving to see that a normal subgroup is equal to a subgroup if one of the subgroup is the identity.
why don't you look to size of group $\frac{G}{H}$?
Mar
29
answered proving to see that a normal subgroup is equal to a subgroup if one of the subgroup is the identity.
Mar
27
reviewed Approve suggested edit on Ring theory question: $I=\langle x,2 \rangle$ prime/maximal ideal in $\mathbb Z[x]$?
Mar
27
reviewed Approve suggested edit on Find the area of the surface obtained by rotating the curve of parametric equations
Mar
26
reviewed Reject suggested edit on Help in the proof of Horrocks theorem
Mar
26
reviewed Approve suggested edit on Help with finding the generating function (with a constant )
Mar
26
reviewed Approve suggested edit on Indexed unions and definitions
Mar
26
reviewed Approve suggested edit on $AB=BA$. Prove $B$ is diagonalizable.
Mar
26
reviewed Approve suggested edit on Solve the following problem…
Mar
26
reviewed Approve suggested edit on determine all polynomials $P(x)$ such that $(x+1)P(x-1)-(x-1)P(x)$ is a constant polynomial