Proving $R(3,3,3)\le17$
52056
Chromatic Triangles on a $K_{17}$ graph
24585
Proving that $\mathbf{W}$+$\mathbf{W^{\perp}}$=$\mathbb{R^{n}}$
145352
How to prove $\sum_{d|n} {\tau}^3(d)=\left(\sum_{d|n}{\tau}(d)\right)^2$
139177
Ramsey Number Inequality: $R(\underbrace{3,3,...,3,3}_{k+1}) \le (k+1)(R(\underbrace{3,3,...3}_k)-1)+2$
39114
Prove that a set in $\mathbb R^3$ is not an algebraic set
133228
Prove $(|x| + |y|)^p \le |x|^p + |y|^p$ for $x,y \in \mathbb R$ and $p \in (0,1]$.
71451
A proof by strong induction that $a_n\le3^n$ where $a_n=a_{n-1}+a_{n-2}+a_{n-3}$
56624
Prove that $0!+1! + 2! + 3! + ..... + n!$ $\neq$ $p^\text{r}$, where $n \geqslant 3$ and $n$, $p$ and $r$ are three integers
46840
How to prove that $\sum_{r=0}^n\binom{n}{r}2^r=3^n$
124208
Proof $|\sin(x) - x| \le \frac{1}{3.2}|x|^3$
47827
Prove that $\sum^{n}_{r=0}(-1)^r\cdot \large\frac{\binom{n}{r}}{\binom{r+3}{r}} = \frac{3!}{2(n+3)}$
115282
Showing that $\mathbb Q(\sqrt{17})$ has class number 1
126427
Proving $\sqrt{2}+\sqrt[3]{3}$ is algebraic.
75639
Showing that $\sqrt[3]{2}\notin\Bbb Q(\alpha_1,...,\alpha_k)$ where $\alpha_i^2\in\Bbb Q\ \forall i$
133017
Prove that $n^n>1\times3\times5\times7\times \dots\times(2n-1)$
72719
Baby Rudin Theorem 1.20 (b) Proof
118918
Understanding a proof that $2x + 3y$ is divisible by $17$ iff $9x + 5y$ is divisible by $17$