$4=5$. Is this possible?
41418
$2+2 = 5$? error in proof
144765
Solving $\sqrt{x+5} = x - 1$
37219
Quadratic Integers in $\mathbb Q[\sqrt{-5}]$
103803
Prove from first princibles $\frac{x^2-4}{x-4} \rightarrow -5$ as $x \rightarrow 3$
58111
Typesetting 144...4 with "n times" under the 4's is easy, but what about \sqrt{144...4}?
60041
Number of real roots of $3^x+4^x=2^x+5^x$ with proof
114393
If $a$ is divisible by $4$, then there exist int $b$ and $c$ such that $a = b^2 - c^2$
152577
Proving $4^n > n^4$ holds for $n\geq 5$ via induction.
3036
Is a polynomial equation of degree $\ge 5$ not solvable by any way?
63710
For x < 5 what is the greatest value of x
40532
Seems that I just proved $2=4$.
116649
Value of: $ \frac {1} {\sqrt {4} + \sqrt {5}} + \frac {1} {\sqrt {5} + \sqrt {6}} + ... + \frac {1} {\sqrt {80} + \sqrt {81}}$
133937
Find the four digit number?
148217
A polynomial with integer coefficients that attains the value $5$ at four distinct points
36182
Why doesn't the last digit method work for divisibility by 4?
10589
How to factorize $5$ in $\mathbb{Z}[\root 3 \of 2]$?
27428
Divisibility test for $4$