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"I couldn't reduce it to the freshman level. That means we don't really understand it," Richard Feynman

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7 How can we identify a set is infinite when proving Bolzano–Weierstrass theorem? Jul 28 '18
6 Proof that a strictly decreasing sequence of nested intervals boils down to a single point. Jul 27 '18
5 Is it true that $\forall \epsilon>0, \exists \text{ infinitely many } n \in \mathbb{N}, s.t. |\sin(n) - 1| < \epsilon$? Jul 21 '18
5 Show $\{-n + 1/n \ : n \in \mathbb{N}\}$ is a closed set Oct 13 '18
4 How to construct a bijection from $[0,1]$ to $[0,1] \times [0,1]$? [duplicate] Sep 8 '18
4 Showing $\frac{1-\cos \left((n-1)\pi/n\right)}{1-\cos \left(\pi/n\right)} \approx 4n^2/\pi^2$ May 6 '19
4 QR decomposition with lower triangular matrix using Householder reflection May 20 '19
4 Showing $f(x) = \frac{x^2}{\sin(x)}$ is analytic near $0$ Jul 15 '19
3 Showing $\exists \xi : \frac{f(\xi)}{n!} = \int \cdots \int_{S_n} f(s_0 x_0 + \cdots + s_n x_n) d s_1 \cdots d s_n$ for unit simplex $S_n$ Sep 23 '19
3 Solving for $L$, where $P_n \cdots P_1 = I - XLX^T$, with $\Vert x_i \Vert_2=1$, $P_i := I - 2x_i x_i^T$, $X=[x_1 \cdots x_n]$ Apr 28 '19
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