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math.n00b

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

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  • Member for 6 years, 11 months
  • 399 profile views
  • Last seen May 7 '17 at 5:49

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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 '14
12 Is it normal that a pure math student doesn't know vector analysis? Jul 19 '14
12 Positive and negative complex numbers? May 9 '14
10 How to prove the inequality $\det (AA^T) \ge 0$? May 9 '14
9 How do people on MSE find closed-form expressions for integrals, infinite products, etc? Jul 22 '14
8 If $R$ is a local ring, is $R[[x]]$ (the ring of formal power series) also a local ring? Oct 25 '14
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 '14
7 Is $R^n$ projective as a $M_n(R)$-module? Dec 9 '16
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 '14
6 A real continuous periodic function with two incommensurate periods is constant. Apr 30 '14
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