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Aug
10
comment combinations groups question
It's a variation of Kirkman's schoolgirl problem: en.wikipedia.org/wiki/Kirkman%27s_schoolgirl_problem
Aug
10
reviewed Looks OK The degree of the field extension $\mathbb Q(\sqrt 2, \sqrt[4] 2,\sqrt[8] 2)$ over $\mathbb Q$ is?
Aug
10
reviewed No Action Needed Approximating $\pi$ by an expression of the form $\sqrt{\sqrt{ \cdots \sqrt{ n!! \cdots !}}}$
Aug
10
revised Is my proof for this fact correct?
added 36 characters in body; edited tags; edited title
Aug
7
reviewed Approve analytic-continuation tag wiki
Aug
7
reviewed Approve fuzzy-set tag wiki
Aug
7
reviewed Approve Origin of the terminology “Completeness” in R
Aug
7
reviewed Approve fuzzy-set tag wiki excerpt
Aug
4
reviewed Looks OK Determining if function odd or even
Jul
26
reviewed Leave Closed $|g(x)| \leq K \int_a^x|g| \ \ \forall x \in I$
Jul
23
reviewed Reopen Show that $f(z)\not=0, \forall z\in \mathbb C$.
Jul
23
reviewed Reviewed How to calculate combinations count for this problem
Jul
23
revised How to calculate combinations count for this problem
added 73 characters in body
Jul
21
reviewed Looks OK How do I explain 2 to the power of zero equals 1 to a child
Jul
20
reviewed Leave Closed Three knights on a 3x3 chess board
Jul
20
reviewed Approve Non empty perfect set in $\mathbb{R}$ which has no rational points
Jul
11
comment Solve $\frac{\tan^3\theta}{1+\tan^2\theta}+\frac{\cot^3\theta}{1+\cot^2\theta} = \sec\theta\csc\theta - 2\sin\theta\cos\theta$
@Akshansh Bhura: Welcome to math.SE: since you are new, I wanted to let you know a few things about the site. In order to get the best possible answers, it is helpful if you say in what context you encountered the problem, and what your thoughts on it are; this will prevent people from telling you things you already know, and help them give their answers at the right level. When its a homework question, please use the 'homework' tag. People will still help, don't worry! Consider editing you question
Jul
10
comment Integrate $\ln x \cos(\ln x) \,dx$
What have you tried? You should start with change of variable $t=\log x$, then $dt=\frac{dx}{x}$
Jul
10
awarded  group-theory
Jul
9
answered Let $H, K$ be two subgroups of $G$. If $|H| = 12$ and $|K|=17$ then $H \cap K = \{e\}$