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3h
comment Prove or disprove divisibility claims?
$a)$ is false, try to look for a counterexample.
3h
revised If $|H|=112$ then $A_7\cap H \lhd H$?
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3h
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.
3h
comment Unions of subspaces
It just indicates sum.
3h
comment Given $k$ distinct linear operators, prove such an $\alpha$ exists
It should have said "infinite field" instead of "infinite set". Fixed.
3h
revised Given $k$ distinct linear operators, prove such an $\alpha$ exists
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11h
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.
11h
answered Given $k$ distinct linear operators, prove such an $\alpha$ exists
12h
comment Given $k$ distinct linear operators, prove such an $\alpha$ exists
What is a number field?
12h
asked If $|H|=112$ then $A_7\cap H \lhd H$?
12h
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.
14h
answered Use the 'rule of sum to prove that $\sum_{k=0}^n 2^k=2^{n+1}-1$.'
1d
comment Question about triangle-free graphs
I fixed some previous typos in my solution, it should be clearer now.
1d
revised Question about triangle-free graphs
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1d
comment If x is even, then x is not divisible by 5.
yes, that is a good counterexample.
1d
revised Question about triangle-free graphs
added 180 characters in body
1d
answered Question about triangle-free graphs
2d
comment Calculating some probability of buying different cards
Does my solution run in time? What is the maximum number of test cases?
2d
asked non-countable subset of $\mathbb 2^{\mathbb Z}$ with finite pairwise intersection.
2d
comment If $(a+b)^n=\sum_{k=0}^{n}{n\choose k}a^{n-k}b^kc_k$, then $c_k=1$?
I think it's clear as day the OP doesn't understand his own question.