What is the value of $z$? $ z^4 = -1$
13909
How to find the roots of $x^4 +1$
30781
Why the representation in the form of $Z'X(X'X)^{-1}X'Z$ can not be simplified into $Z'Z$
117691
Taylor series $\frac{z^2+z}{(z-1)^2}$ at $z=-1$
135087
Find integer solutions of $xy=-1$ (using only elementary ring theory).
134075
Inverse of $A^{-1}+B^{-1}$
105336
What are the solutions to $z^4+1=0$?
34252
$ z^n = a_n + b_ni $ Show that $ b_{n+2} - 2b_{n+1} + 5b_n = 0 $ (complex numbers)
38160
Number of roots of $z^4+z^3+4z^2+2z+3=0$ in each quadrants
66317
How to solve $z^3+z+1=0$?
80648
What's $(-1)^{2/3}\; $?
97952
Square root of 1 is (not) -1
6595
Solve for positive integers: $\frac{4}{13}=\frac{1}{x}+\frac{1}{y}+\frac{1}{z}$
101169
Prove that $x^2 = - 1$ has no solution in $\mathbb{Z}$
146530
If $z$ lies on the circle $|z-1|=1,$ then the value of $\frac{z-2}{z}$ is
94962
For complex $z$, $|z| = 1 \implies \text{Re}\left(\frac{1-z}{1+z}\right)  = 0$
115506
What's wrong with this demonstration? (1 = -1)
156782
Confused about complex numbers