Why is (-1)(-1) = 1?
17515
Why is negative times negative = positive?
13012
Why can a = b imply 2 = 1?
66982
How does negative index work with `Array#[]=`?
121767
Why $\det(A^{-1}) = 1/\det(A)$?
103987
What does the square root of minus $i$ equal?
82097
If $A \succeq B$, is it true that $B^{-1} \succeq A^{-1}$?
43005
Why does this division result in zero?
97952
Square root of 1 is (not) -1
22397
Is 0.9999... equal to -1?
81240
Norm of an inverse operator: $\|T^{-1}\|=\|T\|^{-1}$?
27742
What does "${-#*i}" != "$-" mean?
57623
Does a +1/+1 counter remove a -1/-1 counter?
116043
Why is a raised to the power of Zero is 1?
80648
What's $(-1)^{2/3}\; $?
17963
I have learned that 1/0 is infinity, why isn't it minus infinity?
108923
What is wrong with this false proof? $-1=(-1)^1=(-1)^\frac{2}{2}=((-1)^2)^\frac{1}{2}=\sqrt{(-1)^2}=\sqrt{1}=1$
13363
Why does an argument similiar to 0.999...=1 show 999...=-1?