Why does $i^2 = -1$?
6650
Why $\sqrt{-1 \times -1} \neq \sqrt{-1}^2$?
108923
What is wrong with this false proof? $-1=(-1)^1=(-1)^\frac{2}{2}=((-1)^2)^\frac{1}{2}=\sqrt{(-1)^2}=\sqrt{1}=1$
44596
If $A$ is a square matrix and $A^2 = 0$ then $A=0$. Is this true? If not, provide a counter-example.
80648
What's $(-1)^{2/3}\; $?
115506
What's wrong with this demonstration? (1 = -1)
77486
What is the value of $i^i$?
114346
Why is $a^{-1}$ mod $p$ equal to $a^{p-2}$ mod $p$?
60900
If $A^2=-I$, Prove that $\det{A}=1$
121052
Where is the mistake? $-1=(-1)^{2/2}=\left(\left (-1\right)\displaystyle ^2\right)^{1/2}=1^{1/2}=\sqrt 1=1$
95057
Possible fake proof of $1= -1$
129394
understanding $\frac{\partial x}{\partial y}\frac{\partial y}{\partial z}\frac{\partial z}{\partial x}=-1$
158335
Why is this $0 = 1$ proof wrong?
39908
Finding the error in this proof that 1=2
12217
What is so special about $\alpha=-1$ in the integral of $x^\alpha$?
75387
A proof that $1=2$. May I know why it’s false?
103987
What does the square root of minus $i$ equal?
109674
If $(I-T)^{-1}$ exists, can it always be written in a series representation?