Why does Wolfram Alpha say that $\sqrt{1}=-1$?
3955
Square roots -- positive and negative
34024
Are +0 and -0 the same?
12401
Is it standard to say $-i \log(-1)$ is $\pi$?
122916
Does $[0.9999....]=1$?
13363
Why does an argument similiar to 0.999...=1 show 999...=-1?
116043
Why is a raised to the power of Zero is 1?
3712
Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?
155285
difficulty of accepting $i^2 = -1$ for first timers
114346
Why is $a^{-1}$ mod $p$ equal to $a^{p-2}$ mod $p$?
45261
Why is the determinant of a rotation matrix equal to 1?
115296
Under what conditions does a matrix $A$ have a square root?
80772
What happens when square root is performed in inequalities?
44799
Why is the even root of a number always positive?
80648
What's $(-1)^{2/3}\; $?
111432
Square root of a number squared is equal to the absolute value of that number
17707
Why is ${x^{\frac{1}{2}}}$ the same as $\sqrt x $?
151930
What does it mean by $t=-1$?