Doesn't $i=-i$ from the definition $i^2=-1$?
3712
Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?
77486
What is the value of $i^i$?
75387
A proof that $1=2$. May I know why it’s false?
5526
Prove that $ℤ[i]^*= \{1,-1,i,-i\}$
44596
If $A$ is a square matrix and $A^2 = 0$ then $A=0$. Is this true? If not, provide a counter-example.
155635
Why is the math for negative exponents so?
74207
What is $i$ exponentiated to itself $i$ times?
147528
Where's the error in this $2=1$ fake proof?
27742
What does "${-#*i}" != "$-" mean?
17620
Why the principal value of complex number argument is taken within $(-\pi,\pi]?$
108633
Why $f^{-1}(f(A)) \not= A$
5347
Using the definition of a vector space to prove that $0x = 0$ and $(-1)x = -x$
81875
why is $\sqrt{-1} = i$ and not $\pm i$?
121767
Why $\det(A^{-1}) = 1/\det(A)$?
158335
Why is this $0 = 1$ proof wrong?
107390
Why is (-1)(-1) = 1?
95449
What is the square root of "$i$"?