Finding a mistake in this 'proof' that $1 = 2$.
41418
$2+2 = 5$? error in proof
68092
Does square difference prove that 1 = 2?
81267
A simple doubt in number theory problem.
56169
What mistakes, if any, were made in Numberphile's proof that $1+2+3+\cdots=-1/12$?
40532
Seems that I just proved $2=4$.
121469
Proof of observations on natural numbers being expressed as differences of squares.
29692
Proof verification: elementary Number Theory Proof of $am+bn = 1$
83778
An incorrect proof by exhaustion
80004
Why is $1/i$ equal to $-i$?
121544
Proof by Induction: $2(\sqrt{n+1} - \sqrt{n}) < \frac{1}{\sqrt{n}} < 2(\sqrt{n}-\sqrt{n-1})$
67588
Why does $|e^{ix}|^2 = 1$?
53123
Trying to derive a contradiction with this simple inequality,
76696
Using induction to prove $2^{n-1}(1 + a_1a_2\ldots a_n) \geq (1+a_1)(1+a_2)\ldots(1+a_n)$ for $a_i \geq 1$
92595
A problem regarding the in-equality of complex numbers .
13899
Proof that $-v = (-1)*v$
95057
Possible fake proof of $1= -1$
115460
Proving $a\mid b^2,\,b^2\mid a^3,\,a^3\mid b^4,\ldots\implies a=b$ - why is my approach incorrect