Why doesn't $A^2=I$ imply $A=\pm I$?
118304
If $A^2 = I$ (Identity Matrix) then $A = \pm I$
19216
Proving that $\arctan(x)+\arctan(1/x)=\pm \pi/2$, could this line of reasoning possibly be correct?
113168
If $a > b$, is $a^2 > b^2$?
64747
If $A^m=I$ then A is Diagonalizable
5679
Why is $2\pi i \neq 0?$
106584
If $A^{2n}=I$, then $A^n=\pm I$ where $A\in M_n(\mathbb{R})$
114346
Why is $a^{-1}$ mod $p$ equal to $a^{p-2}$ mod $p$?
35155
To prove Cayley-Hamilton theorem, why can't we substitute $A$ for $\lambda$ in $p(\lambda) = \det(\lambda I - A)$?
58212
Why doesn't the quadratic equation contain $2|a|$ in the denominator?
60348
How do I prove $F(a)=F(a^2)?$
47313
What is $i^i$ and $(i^i)^i$
145397
How to prove that for every $i$, $a_i = i$
15908
Is it true that $\int_{a}^b h^2=0\implies h=0$?
95145
Does $\exp(2ir\pi)$ equal $1$? What's wrong?
67784
If $A + A^t = 2I$ then $\det(A) \geq 1$
77486
What is the value of $i^i$?
52461
Why does $(g^b \bmod m)^a \bmod m = (g^a \bmod m)^b \bmod m$?