A trick to make $\frac{1}{i} = i$ (contradicting $\frac{1}{i} = -i)$
3712
Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?
104158
$\frac 00=$ ? Why It is un answerable?
145444
Solve $\dfrac{1}{1+\frac{1}{1+\ddots}}$
25959
How do you compute negative numbers to fractional powers?
27969
Why does $\frac{1}{x} < 4$ have two answers?
102019
How to solve inequality $1-\frac{1}{x}\geq 0$ correctly?
45361
Checking the consistency and Bias of $\frac{\sum X_i +\sqrt{n}/2}{n+\sqrt{n}}$
138559
How can I show that $\frac{1}{1+|z|^2}$ isn't analytic at $z=1$?
138107
Showing that $\left|\frac{z-a}{1-\bar{a}z}\right|=1$
20317
Proving $\sum_{k=1}^{n}{(-1)^{k+1} {{n}\choose{k}}\frac{1}{k}=H_n}$
101320
How to tell $i$ from $-i$?
14064
Proof by induction that $\sum_{i=1}^n \frac{i}{(i+1)!}=1- \frac{1}{(n+1)!}$
150417
Two apparently different antiderivatives of $\frac{1}{2 x}$
4816
How to solve $\frac 1{1.2.3}+\frac 1{2.3.4}+\frac 1{3.4.5}+...$
95057
Possible fake proof of $1= -1$
97952
Square root of 1 is (not) -1
76532
Two different expansions of $\frac{z}{1-z}$