Abhra Abir Kundu
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 Nov 8 awarded Yearling May 29 reviewed Approve Behaviour of solutions to ODE near singular points Dec 9 awarded Caucus Nov 8 awarded Yearling Sep 30 awarded Explainer Jun 22 revised Prove that $(k.n)!$ is divisible by $(k!)^n$ added 357 characters in body Jun 22 answered Prove that $(k.n)!$ is divisible by $(k!)^n$ Feb 8 comment Continuous function between two topological space. Thanks a lot for the answer.I have another question.It will be helpful if you can provide an answer to that too.The question is the following- If $A\in \tau$ is closed then does it mean $\{1,0\}\in A$? I basically want to know whether $\{1,0\}$ belongs to every sets closure? Feb 8 accepted Continuous function between two topological space. Feb 8 revised Continuous function between two topological space. added 27 characters in body Feb 8 comment Continuous function between two topological space. @DanielFischer I mean all open subsets of $(R,\sigma)$ contained in $[0,1]$. Feb 8 comment Continuous function between two topological space. @DanielFischer it is $[0,1]$ so it is closed in $(R,\sigma)$ Feb 8 asked Continuous function between two topological space. Jan 30 comment Is there any good approximation for $\prod_{i=3}^k (n-i)$? $(n \gg k)$ You might use Stirling's approximation-en.wikipedia.org/wiki/Stirling%27s_approximation Jan 7 revised Coefficient of $x^n$ in the series added 45 characters in body Jan 7 comment Coefficient of $x^n$ in the series $1+x+2x+3x^2+\cdots=\frac{d}{dx}\big(1+x+x^2+\cdots\big)$ is not correct, rather it will be $$1+2x+3x^2+4x^3+\cdots=\frac{d}{dx}\big(1+x+x^2+\cdots\big)$$ Jan 7 answered Coefficient of $x^n$ in the series Nov 25 comment Let $N$ be a submodule of $R$-module $M$, $M/N$ is free $R$-module. Prove that $N$ is direct summand of $M$. You are welcome @user109584 Nov 25 answered Let $N$ be a submodule of $R$-module $M$, $M/N$ is free $R$-module. Prove that $N$ is direct summand of $M$. Nov 8 awarded Yearling