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Babak Miraftab

Tehran, Iran

https://uni-hamburg.academia.edu/BabakMiraftab

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22
Does $\sum\limits_{n=1}^\infty\frac{1}{\sqrt{n}+\sqrt{n+1}}$ converge?
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18
The limit of $\tan(n)$
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17
Proving a trig identity: $\frac{\sin(A + B)}{\sin(A - B)}=\frac{\tan A + \tan B}{\tan A - \tan B}$
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16
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 $b$?
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15
A characteristic subgroup is a normal subgroup
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11
Group question: only one element $x$ with order $n>1$, then $x\in Z(G)$
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8
Prove Sylvester rank inequality: $\text{rank}(AB)\ge\text{rank}(A)+\text{rank}(B)-n$
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7
Example of a commutative ring that is Artinian but not Noetherian
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7
Evaluate the Integral $\int \sqrt{1-4x^2}\ dx$
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6
find a special element of $Sp(2n,q)$
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6
Every element of a finite abelian group with square free order equivalence
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6
Prove that an element $\bar{x}$ is its own inverse iff $\bar{x} = 1,-1$
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6
Name for bipartite graph that allows edges amongst its two sets of nodes.
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6
Irreducible Representation and the center of a group
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6
Characterizing groups with linear subgroups
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5
In a group, does $[G:H] \leq |N|$ always imply $[G:N] \leq|H|$?
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5
$r$ is not nilpotent, $r-r^2$ is nilpotent, then the ring has a non-zero idempotent
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5
Isomorphisms between group of functions and $S_3$
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5
$n$-abelian Groups
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5
Let $V$ be a finite dimensional vector space and $T$ be linear operator on $V$
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5
Reference Request: Characters of Finite General Linear Groups
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5
Order of automorphism group
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5
What is the centralizer of (1 2 3)(4 5 6) in $S_6$
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5
Product of cyclic groups
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5
Why this graph has automorphism group is isomorphic to the cyclic group of order 4?
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