Serkan

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91 Answers

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11
What's the difference between $3^{3^{3^3}}$ and $27^{27}\;$?
10
Theorems with an extraordinary exception or a small number of sporadic exceptions
10
Countable set having uncountably many infinite subsets
9
Proving an invertible matrix which is its own inverse has determinant $1$ or $-1$?
8
Group of order 1225 is abelian
8
Commutator subgroup of a subgroup
8
Example computation of $\operatorname{Tor_i}{(M,N)}$
7
How many elements of order $7$ are there in a group of order $28$ without Sylow's theorem
7
subgroup of direct product of two groups
6
Is $SL_n(\mathbb{R})$ a normal subgroup in $GL_n(\mathbb{R})$?
6
what $D_8/D_8$ is isomorphic to
6
Minimal polynomial of $\sqrt2+1$ in $\mathbb{Q}[\sqrt{2}+\sqrt{3}]$
5
Does $gHg^{-1}\subseteq H$ imply $gHg^{-1}= H$?
5
Show the inequality $\sigma(n)\phi(n) \geq n^2(1-\frac{1}{p_1^2})(1-\frac{1}{p_2^2})\cdots(1-\frac{1}{p_r^2})$
5
Winning strategy
4
on the commutator subgroup of a special group
4
radical of sum of two ideals
4
Can a group of order 3000 be a simple group?
4
Please help me, Group Theory. Prove $b^{33}=e$.
4
In $Q_8$ why $C_G(i)=C_G(-i)$
4
Find a nonabelian subgroup of order $10$ in $D_{15}$
4
number theory fibonacci
4
Is it possible to prove that if $g \in G$ with $G$ finite, then $o(g) \mid |G|$ without using Lagrange's theorem?
4
Proving a group is simple
4
How to prove that $A_5$ has no subgroup of order 30?
3
If the order of a finite abelian group is not divisible by a square, show that the group must be cyclic.
3
Writing a group element as $ghg^{-1} h^{-1}$ and as $g^2 h^2$
3
Quotient groups and homomorphism
3
Symmetric Groups and Commutativity
3
Prove that $x-1$ divides $x^n-1$
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