Is the argument used by the Numberphile video to show that $1 + 2 + 3 + 4 + \dots = -1/12$ valid?
4340
Why does $1+2+3+\cdots = -\frac{1}{12}$?
118517
Does this constitute a valid proof that $\frac{x^2}{1+x^4} \leq \frac{1}{2}$?
62061
Do we have negative prime numbers?
6721
math fallacy problem: $-1= (-1)^3 = (-1)^{6/2} = \sqrt{(-1)^6}= 1$?
154459
Constructing a HoTT proof term of 1≠0
108021
What does the factorial of a negative number signify?
286
Is it true that $0.999999999\ldots=1$?
136444
Evaluating $\sum_{n=0}^\infty\frac{(-1)^n}{3n+1}$
37826
Is $0.23571113171923293137\dots$ transcendental?
109440
How does $(12\dots n)$ and $(a\, b)$ generate $S_n$?
68233
Fermat's little theorem's proof for a negative integer
40534
What is $(-1)^{\frac{2}{3}}$?
85287
Prove that, for $p > 3$, $(\frac 3p) = 1$ when $p \equiv 1,11 \pmod{12}$ and $(\frac 3p) = -1$ when $p \equiv 5,7 \pmod{12}$
52206
How to prove with double counting technique that $1+2+\dots+2^n=2^{n+1} -1$?
9960
Sum of an infinite series $(1 - \frac 12) + (\frac 12 - \frac 13) + \cdots$ - not geometric series?
108873
How would one be able to prove mathematically that $1+1 = 2$?
14633
What's the thing with $\sqrt{-1} = i$