$2 + 2 = 5$ (Fake proof, or ?)
41418
$2+2 = 5$? error in proof
44440
Prove $\sqrt{2}+\sqrt[3]{5}$ is irrational
11506
Alternative proof that $(a^2+b^2)/(ab+1)$ is a square when it's an integer
19628
What is wrong with this fake proof $e^i = 1$?
40532
Seems that I just proved $2=4$.
115976
$\mathbf{Q}[\sqrt 5+\sqrt[3] 2]=\mathbf{Q}[\sqrt 5,\sqrt[3] 2]$?
106965
How to algebraically prove $\binom{n+m}{2} = nm + \binom{n}{2} + \binom{m}{2}$?
100399
A doubt with a part of a certain proof.
139755
Prove that $\sqrt{2}+\sqrt{3}+\sqrt{5}$ is irrational. Generalise this.
78351
Why is $(2, 1+\sqrt{-5})$ not principal?
12949
Inductive Proof of Euler's Formula $v-e+r=2$
117999
Prove by contradiction (not using a calculator) that $\sqrt6 + \sqrt2 < \sqrt{15}$?
109532
Proving $5^n \equiv 1 \pmod {2^r}$ when $n=2^{r-2}$
142132
How do you prove $\sum \frac {n}{2^n} = 2$?
82083
Solving $(z+1)^5 = z^5$
60712
Induction Proof: Fibonacci Numbers Identity with Sum of Two Squares
44528
The only natural number $x$ for which $x+\sqrt{-2}$ is a cube in $\mathbb{Z}[\sqrt{-2}]$ is $x=5$