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Apr
24
answered Proving that if a set is both open and closed then it is equal to the real numbers
Apr
24
answered Classify $ \mathbb{Z}_9\times\mathbb{Z}_8\times\mathbb{Z}_8$/<(3,2,4)> according to the fundamental theorem of finitely generated abelian groups.
Apr
24
awarded  Notable Question
Apr
23
comment Subgroups of every order dividing the order of the group imply the group is abelian?
Thank you for your answer, Can you please rephrase or explain the theorem you are taking about "if divides the order of a group with a prime, then the group has a subgroup of order " it seems to be missing a word or two and it sounds like Cauchy theorem..
Apr
23
comment If $f^2$ integrable, then $|f|$ is integrable?
Don't you need to know that $|f|$ (or $f$) is integrate to begin with ? The space of which this inequality is deduced is the space of integrable functions $f$
Apr
23
accepted Subgroups of every order dividing the order of the group imply the group is abelian?
Apr
23
comment Subgroups of every order dividing the order of the group imply the group is abelian?
@Timbuc - I see your point. But this seems to answer only (2), can you also give an example for (1) ? thanks!
Apr
23
comment Groups with “few” subgroups
@mathmandan - Very interesting, I'll be sure to read it. thanks!
Apr
23
asked Subgroups of every order dividing the order of the group imply the group is abelian?
Apr
23
comment Groups with “few” subgroups
@mathmandan - How do you know such subgroups of $T$ exist ?
Apr
23
comment Groups with “few” subgroups
How do you know that $P$ exist ?
Apr
23
revised Solving a cubic equation $x^3+15x^2+24x-40=0$
rolled back to a previous revision
Apr
23
reviewed Approve A fun problem by Arnold using the Poincaré recurrence theorem
Apr
20
comment Finding all possible pairs of positive integer values
Because I can assume without loss of generality that x>=y (otherwise y>=x and we change their names ). I have used this in the first equation, the LHS is positive and by that assumption the RHS is also positive
Apr
19
revised Finding all possible pairs of positive integer values
deleted 9 characters in body
Apr
18
answered If $4=5$, then $6=8\,$ (yes or no?)
Apr
18
answered Finding all possible pairs of positive integer values
Apr
18
revised Self contained book on Ricci Flow/Geometric Analysis
edited tags
Apr
18
reviewed Approve Simple equation re-arrangement
Apr
18
answered Is this permutations or combinations?