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2d
answered What is the most complex mathematical topic?
2d
comment The concept of parity for members in a group
So $a^{2c+1}$??
2d
asked Number of divisors $d$ of $n^2$ so that $d\nmid n$ and $d>n$
2d
comment The concept of parity for members in a group
$a^c+a^{c+1}$? what is adition?
2d
revised What phenomenon is this? $(2\Bbb{Z} + 1)\cup 3\Bbb{Z} = 2\Bbb{Z} \cup 3\Bbb{Z} + 3$
added 774 characters in body
2d
comment What phenomenon is this? $(2\Bbb{Z} + 1)\cup 3\Bbb{Z} = 2\Bbb{Z} \cup 3\Bbb{Z} + 3$
@JeremyBrazas I think he means $(2\mathbb Z \cup 3\mathbb Z)+3$
2d
answered What phenomenon is this? $(2\Bbb{Z} + 1)\cup 3\Bbb{Z} = 2\Bbb{Z} \cup 3\Bbb{Z} + 3$
Aug
31
comment Prove or disprove divisibility claims?
How can the second question be out of your scope, that is inconsistent with your username.
Aug
31
accepted If $|H|=112$ then $A_7\cap H \lhd H$?
Aug
31
comment Prove or disprove divisibility claims?
$a)$ is false, try to look for a counterexample.
Aug
31
revised If $|H|=112$ then $A_7\cap H \lhd H$?
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Aug
31
comment If $|H|=112$ then $A_7\cap H \lhd H$?
How are you going to make $A_7$ fit inside a group of size $112$? Taking $H=G$ is not possible.
Aug
31
comment Unions of subspaces
It just indicates sum.
Aug
31
comment Given $k$ distinct linear operators, prove such an $\alpha$ exists
It should have said "infinite field" instead of "infinite set". Fixed.
Aug
31
revised Given $k$ distinct linear operators, prove such an $\alpha$ exists
added 2 characters in body
Aug
31
comment Given $k$ distinct linear operators, prove such an $\alpha$ exists
I transcribed the proof of the theorem here: math.stackexchange.com/a/1363474/33907 . Although it is explained better in Roman's book.
Aug
31
answered Given $k$ distinct linear operators, prove such an $\alpha$ exists
Aug
31
comment Given $k$ distinct linear operators, prove such an $\alpha$ exists
What is a number field?
Aug
31
asked If $|H|=112$ then $A_7\cap H \lhd H$?
Aug
31
comment Partitioning a number as a sum of $k$ non-zero numbers, but order does not matter
there are some recursions you can use though.