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3h
comment Number of divisors $d$ of $n^2$ so that $d\nmid n$ and $d>n$
It does. The number of values so that $d<n$ is intimately related to the number of values of $d$ so that $d$ does not divide $n$
5h
revised An RMO level question
added 8 characters in body
5h
comment An RMO level question
@goku13 done . ${}{}{}$
5h
answered An RMO level question
6h
comment Number of divisors $d$ of $n^2$ so that $d\nmid n$ and $d>n$
The question is formatted like that because it gives you a hint.
6h
comment An RMO level question
This looks far away from RMO level.
6h
answered What is the most complex mathematical topic?
6h
comment The concept of parity for members in a group
So $a^{2c+1}$??
6h
asked Number of divisors $d$ of $n^2$ so that $d\nmid n$ and $d>n$
6h
comment The concept of parity for members in a group
$a^c+a^{c+1}$? what is adition?
7h
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
7h
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 $(2\mathbb Z \cup 3\mathbb Z)+3$
7h
answered What phenomenon is this? $(2\Bbb{Z} + 1)\cup 3\Bbb{Z} = 2\Bbb{Z} \cup 3\Bbb{Z} + 3$
1d
comment Prove or disprove divisibility claims?
How can the second question be out of your scope, that is inconsistent with your username.
1d
accepted If $|H|=112$ then $A_7\cap H \lhd H$?
1d
comment Prove or disprove divisibility claims?
$a)$ is false, try to look for a counterexample.
1d
revised If $|H|=112$ then $A_7\cap H \lhd H$?
added 2 characters in body
1d
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.
1d
comment Unions of subspaces
It just indicates sum.
1d
comment Given $k$ distinct linear operators, prove such an $\alpha$ exists
It should have said "infinite field" instead of "infinite set". Fixed.