Can we say that $i = -\sqrt{-1}$ because $i^2 =- 1$?
35856
Refining my knowledge of the imaginary number
78736
Check my proof that $(ab)^{-1} = b^{-1} a^{-1}$
12401
Is it standard to say $-i \log(-1)$ is $\pi$?
68092
Does square difference prove that 1 = 2?
41645
Checking my understanding: $1 - 1 + 1 - 1 + 1 - ... = \frac{1}{2}$
82097
If $A \succeq B$, is it true that $B^{-1} \succeq A^{-1}$?
121052
Where is the mistake? $-1=(-1)^{2/2}=\left(\left (-1\right)\displaystyle ^2\right)^{1/2}=1^{1/2}=\sqrt 1=1$
134075
Inverse of $A^{-1}+B^{-1}$
80004
Why is $1/i$ equal to $-i$?
143733
Is this proof that $\sqrt 2$ is irrational correct?
82630
How is it, that $\sqrt{x^2}$ is not $ x$, but $|x|$?
95057
Possible fake proof of $1= -1$
142845
is $y = \sqrt{x^2 + 1}− x$ a injective (one-to-one) function?
17542
Why is $\sqrt{-x}*\sqrt{-x}=-x?$
51769
If $x,y,z\in[-1,1]$ and $1+2xyz\geq x^2+y^2+z^2$, then can we infer $1+2(xyz)^n\geq x^{2n}+y^{2n}+z^{2n}$?
110661
When does $\sqrt{a b} = \sqrt{a} \sqrt{b}$?
81585
What is the square root of complex number i?