Mathematics
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math.n00b
  • Member for 8 years, 2 months
  • Last seen more than 5 years ago
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53
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question
18
How did Euler realize $x^4-4x^3+2x^2+4x+4=(x^2-(2+\alpha)x+1+\sqrt{7}+\alpha)(x^2-(2-\alpha)x+1+\sqrt{7}-\alpha)$?
May 6, 2014
answer
14
Positive and negative complex numbers?
May 9, 2014
question
12
Is it normal that a pure math student doesn't know vector analysis?
Jul 19, 2014
answer
11
How to prove the inequality $\det (AA^T) \ge 0$?
May 9, 2014
question
10
How do people on MSE find closed-form expressions for integrals, infinite products, etc?
Jul 22, 2014
question
10
If $R$ is a local ring, is $R[[x]]$ (the ring of formal power series) also a local ring?
Oct 25, 2014
question
8
Is $R^n$ projective as a $M_n(R)$-module?
Dec 9, 2016
question
7
Every $x \in (0,1]$ can be represented as $x = \sum_{k=1}^{\infty} 1/{n_k}$, such that $n_{k+1}/n_k\in \{2,3,4\}$
Mar 14, 2014
question
7
If $(n_k)$ is strictly increasing and $\lim_{n \to \infty} n_k^{1/2^k} = \infty$ show that $\sum_{k=1}^{\infty} 1/n_k$ is irrational
Mar 14, 2014
question
7
A real continuous periodic function with two incommensurate periods is constant.
Apr 30, 2014

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