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Jul
26
reviewed Leave Closed $|g(x)| \leq K \int_a^x|g| \ \ \forall x \in I$
Jul
26
reviewed Reopen A question about primitive idempotent of group algebra
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 Constant parametric curves in terms of $x$ and $y$
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 $H \cap K = \{e\}$
Jul
7
comment Can you solve this? $15\cdot(3^{x+1}) - 243\cdot(5^{x - 2}) = 0$
@Will: Notice that $15=3\cdot 5$ and $243=3^5$. Dividing by $3$ gives you $5\cdot 3^{x+1}=3^4\cdot 5^{x-2}$. From here finding $x$ is very easy
Jul
4
accepted Exercise from Serre's “Trees” - prove that a given group is trivial
Jul
4
comment Exercise from Serre's “Trees” - prove that a given group is trivial
Because I didn't find that question before posting my question...
Jul
3
comment Exercise from Serre's “Trees” - prove that a given group is trivial
As to the guys who voted to close: The question you offer does, indeed, contain an answer, but not the question directly. In fact, in that answer it is said that "It is well known that..."
Jul
3
comment Exercise from Serre's “Trees” - prove that a given group is trivial
So, judging by the comments there, my approach was correct. But then this exercise seems completely pointless...
Jul
3
asked Exercise from Serre's “Trees” - prove that a given group is trivial
Jun
25
comment How to write $n!=a^{\alpha_0}(a+1)^{\alpha_1}(a+2)^{\alpha_2}\cdots(a+r)^{\alpha_r}$?
@Anjan3: Then you should change "Now I am willing to write $n$ as..." to "$n!$ as..."