Why does $e^{i\pi}=-1$?
742
How to prove Euler's formula: $e^{i\varphi}=\cos(\varphi) +i\sin(\varphi)$?
95057
Possible fake proof of $1= -1$
158335
Why is this $0 = 1$ proof wrong?
14633
What's the thing with $\sqrt{-1} = i$
85311
Proving that $e^{\pi}-{\pi}^e\lt 1$ without using a calculator
154001
$(g\circ f)^{-1}=f^{-1}\circ g^{-1}$
80648
What's $(-1)^{2/3}\; $?
81875
why is $\sqrt{-1} = i$ and not $\pm i$?
5526
Prove that $ℤ[i]^*= \{1,-1,i,-i\}$
44400
$e^{2\pi i x} = (e^{2\pi i})^x$: What happens if x is rational?
100968
Why is $|e^{i \lambda z}| |e^{- \lambda y}|= |e^{- \lambda y}|$ here?
103987
What does the square root of minus $i$ equal?
105423
Why doesn't every integral from 0 to $2\pi$ equal zero?
101320
How to tell $i$ from $-i$?
12401
Is it standard to say $-i \log(-1)$ is $\pi$?
41191
How to prove this $\pi$ formula?
73829
Coulomb's Law: why is $k = \dfrac{1}{4\pi\epsilon_0}$