4,346 reputation
11140
bio website sharif.academia.edu/…
location Tehran, Iran
age 25
visits member for 3 years, 7 months
seen 1 hour ago

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Nov
20
awarded  Enlightened
Nov
20
awarded  Nice Answer
Nov
20
comment The limit of $\tan(n)$
I like your proof.
Nov
20
revised The limit of $\tan(n)$
edited body
Nov
20
comment The limit of $\tan(n)$
It is one of my favorite problem of calculus.
Nov
20
answered The limit of $\tan(n)$
Nov
17
reviewed Approve Prove that for a real matrix $A$, $\ker(A) = \ker(A^TA)$
Nov
6
reviewed Approve annual and effective annual interest rate
Nov
5
reviewed Approve A proof involving Fermat's Little Theorem.
Nov
5
reviewed Approve Triple Integral Application Question
Nov
4
reviewed Reject Help to compute all powers $A^{n}$ and find is the matrix of $A$ diagonal?
Nov
4
comment Prove isomorphism for a commutative ring
For instance, you want to define $\phi(r)$ by using $\phi(1)=m$. So u can see that $\phi(r)=r\phi(1)=r.m$. Is it clear?
Nov
4
answered Prove isomorphism for a commutative ring
Nov
2
reviewed Approve question about normal subgroup and question about notation
Nov
1
reviewed Approve Ring of integers with prime numbers
Nov
1
reviewed Approve How to express other logical operations via Pierce's arrow?
Nov
1
reviewed Approve Evaluation of a limit of a particular limit
Oct
23
awarded  Popular Question
Oct
19
reviewed Approve Beautiful problem on a progression
Oct
18
revised Proving ring $R$ with unity is commutative if $(xy)^2 = x^2y^2$
deleted 1 character in body