If $i^2=-1$, then what about $(-i)^2=-1$?
101320
How to tell $i$ from $-i$?
114346
Why is $a^{-1}$ mod $p$ equal to $a^{p-2}$ mod $p$?
10828
If $A^2 = I$, then $A$ is diagonalizable, and is $I$ if $1$ is its only eigenvalue
124209
How is $\ln(-1) = i\pi$?
121767
Why $\det(A^{-1}) = 1/\det(A)$?
140086
Does $3-4+1$ equal $0$ or $-2$.. or maybe $2$?
101169
Prove that $x^2 = - 1$ has no solution in $\mathbb{Z}$
14633
What's the thing with $\sqrt{-1} = i$
81875
why is $\sqrt{-1} = i$ and not $\pm i$?
150229
Find all the values of $(1+i)^{(1-i)}$
30860
Prove that $f(x)=0$ in $[-1,1]$.
27742
What does "${-#*i}" != "$-" mean?
5679
Why is $2\pi i \neq 0?$
87848
Formal proof for $(-1) \times (-1) = 1$
86866
Is there a number whose absolute value is negative?
59818
Why $(-2)^{2.5}$ isn't equal to $((-2)^{25})^{1/10}$?
34430
Why does $(\frac{p-1}{2}!)^2 = (-1)^{\frac{p+1}{2}}$ mod $p$?