Proving $A^2 = 0$ given $A^5 = 0$
32103
Show that for a $2\times 2$ matrix $A^2=0$
125707
A simple proof (hopefully) for $2^x \neq 0$
112575
Finding integer solutions of $m^2-n^5 = m - n$
41418
$2+2 = 5$? error in proof
31783
Is this proof of $ab = 0$ correct?
15191
If $a^2$ divides $b^2$, then $a$ divides $b$
70522
$y^2 = \frac{x^5 - 1}{x-1}$ & $x,y \in \mathbb{Z}$
152039
Prove that $a^{2^n}=1 \mod 2^{n+2}$
106374
Show that $2x^6+12x^5+30x^4+60x^3+80x^2+30x+45=0$ has no real roots
25870
Prove that $0 \leq ab + ac + bc - abc \leq 2.$
137970
$2 + 2 = 5$ (Fake proof, or ?)
142263
Assuming $ab^2 = b^3a$ and $a^2=1$ prove that the order of $b$ is $5$.
3433
Proof if $a \vec v = 0$ then $a = 0$ or $\vec v = 0$
89279
If $\sum a_n/k^n = 0$ for all $k$, then $a_n = 0$ for all $n$
11506
Alternative proof that $(a^2+b^2)/(ab+1)$ is a square when it's an integer
66451
In a ring, how do we prove that a * 0 = 0?
52930
Prove or disprove : $a^3\mid b^2 \Rightarrow a\mid b$