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Nov
7
awarded  Organizer
Nov
7
comment Evaluate $\int_{-1}^{1} \exp(x+e^{x})\,dx$
You are fast ;)
Nov
7
comment Subgroups of Order $p^2$ in $\mathbb{Z}_p \oplus \mathbb{Z}_p$
You already say that the order of the group is $p^2$. So you have a bag with $X=p^2$ items. You take $X$ items and put them in another bag. How many ways to do this?
Nov
7
comment Examples of mathematical discoveries which were kept as a secret
I'm not anything near an expert in math history but you are saying that we have no evidence of Fermat proving for example that $x^4+y^4=z^4$ has no solutions or any of the many theorems that carry his name?
Nov
7
comment Examples of mathematical discoveries which were kept as a secret
Very interesting! Hidden by accident.
Nov
6
comment Reference request for unknown mathematical constant
Using $\frac{1}{m(m+1)^2} = \frac{1}{m} - \frac{1}{m+1} - \frac{1}{(m+1)^2}$
Nov
6
comment Does the A001921 linear recurrent integer sequence always yield composite numbers?
Why you considered $a(64n+17)$ and not $a(64n+33)$?
Nov
6
comment Union of power sets of the counting numbers
It's an infinite set that its elements are finite.
Nov
6
comment Prove that $\frac{1}{a^3(b+c)}+\frac{1}{b^3(a+c)}+\frac{1}{c^3(a+b)}\ge \frac32$
How will you use the Cauchy-Schwarz? Do you mean the AM-GM inequality perhaps?
Nov
6
comment Proving that $\frac{\pi ^2}{p}\neq \sum_{n=1}^{\infty }\frac{1}{a_{n}^2}$
What are the $a(n)$? Are you asking to prove that no sequence of positive integers can have this as result?
Nov
6
revised does $\int_0^\infty x/(1+x^2 \sin^2x) \mathrm dx$ converge or diverge?
Perhaps this is a better presentation of the proof's logic
Nov
6
suggested approved edit on does $\int_0^\infty x/(1+x^2 \sin^2x) \mathrm dx$ converge or diverge?
Nov
4
comment “Negative” versus “Minus”
Why is this question protected and not closed as off-topic? It could well fit to Mathematics Education site, but not here in my opinion.
Nov
4
comment Why is $Z_2 \times Z_3 \times Z_4$ not isomorphic to $Z_{24}$?
Do 2 and 4 share no common factor?
Nov
4
comment How would you show that $\sqrt{14+4\sqrt{10}} - \sqrt{14-4\sqrt{10}} = 4$?
Nice. One could also prove first that (for $0<b<a$) this is true: $ \sqrt{a + b +- 2\sqrt a \sqrt b} = \sqrt a +- \sqrt b $ and then use it with $a=10$ and $b=4$
Nov
4
comment Does $A193201$ count the partitions of $n$ of arbitrary dimension?
I get 14 for n=6. I might have not understood what exactly we are counting. This?: A119268
Nov
3
comment Examples of mathematical discoveries which were kept as a secret
@DavidRicherby I think you could add it as a separate answer. While belonging to the same area (security/cryptography), it is a different discovery.
Nov
3
comment How many possible color combinations?
I don't think there is a closed formula for T(n,m).
Nov
3
revised How many possible color combinations?
deleted 1 character in body
Nov
3
answered How many possible color combinations?