Mathematics
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Apparently, this user prefers to keep an air of mystery about them.

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Top posts (182) All Questions Answers | Votes Newest

11 Show that $\mathbb{Z}_{2} \times \mathbb{Z}_{4}$ is not a cyclic group Nov 3 '13
8 If $f,g$ are continuous at $a$, show that $h(x)=\max\{f(x),g(x)\}$ and $k(x)=\min\{f(x),g(x)\}$ are also continuous at $a$ Feb 13 '14
8 Ethical problems in mathematics Feb 14 '13
8 Show that ${-n \choose i} = (-1)^i{n+i-1 \choose i} $ May 6 '13
7 Solve $u_{xx}-3u_{xt}-4u_{tt}=0$ where $u(x,0)=x^2$ and $u_t(x,0)=e^x$ Feb 17 '13
7 Show $f''+vf' +\alpha^2 f(1-f)=0$ has solutions satisfying $\lim_{x \to - \infty}f=0$ and $\lim_{x \to \infty}f=1$ given $v\leq -2\alpha < 0$ Oct 22 '13
7 $M,N\in \Bbb R ^{n\times n}$, show that $e^{(M+N)} = e^{M}e^N$ given $MN=NM$ Nov 15 '13
7 $G(n) = 1 + \sum\limits_{ \substack{d|n\\d != 1\\d\neq n}}G(n /d)$, how to solve for $G(n)=n$. Nov 21 '17
6 What is the intuition behind this question (Graph theory with applications, Bondy and Murty Q1.2.9) Sep 3 '18
6 Solve $y^{\prime \prime}-(y^{\prime})^2-y^{\prime}=0$ Jan 28 '13
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