What is the $B^{-1}$ if $B^2 -5B + I = 0$
30882
Proving Invertibility and Eigenvalues
107390
Why is (-1)(-1) = 1?
16749
Let $A_i= \left \{...,-2,-1,0,1,...,i \right\}$. Find $\bigcup_{i=1}^{n} A_i$ and $\bigcap_{i=1}^{n} A_i$
37219
Quadratic Integers in $\mathbb Q[\sqrt{-5}]$
123275
Prove $[A,B^n] = nB^{n-1}[A,B]$
129521
Is $\sqrt[3]{5}$ in $\mathbb Q(\sqrt[3]{2})$?
14150
Zero to the zero power – is $0^0=1$?
27281
How to prove $\,x^a-1 \mid x^b-1 \iff a\mid b$
82083
Solving $(z+1)^5 = z^5$
101320
How to tell $i$ from $-i$?
14633
What's the thing with $\sqrt{-1} = i$
78736
Check my proof that $(ab)^{-1} = b^{-1} a^{-1}$
44309
Prove $5a^2 ≠ 3b^2$ for all non-zero rational numbers $a$ and $b$
108923
What is wrong with this false proof? $-1=(-1)^1=(-1)^\frac{2}{2}=((-1)^2)^\frac{1}{2}=\sqrt{(-1)^2}=\sqrt{1}=1$
126859
$\Bbb Z^\ast$ What is this notation?
124209
How is $\ln(-1) = i\pi$?
33105
Find the value of $a^2-b^2+c^2$