vinaur

Here's an example of -1=1 (incorrect of course, but I won't tell where, yet):

1) 1=1
2) 1/1=1/1
3) -1/1=-1/1
4) -1/1=1/-1
5) sqrt(-1/1)=sqrt(1/-1)
6) sqrt(-1)/sqrt(1)=sqrt(1)/sqrt(-1)
7) i/1=1/i
8) i^2=1
9) -1=1