This does not prove 0=1, does not divide by zero (in a tricky, unforseen way), does not take the square root of a negative number, and this isn't net.math. I saw this in an MIT fraternity (TEP) rush book:
Proof by Rotation (Not to be confused with circular reasoning)
Prove: 1
--- = 0 (1 over infinity equals zero)
oo
Proof: 1
--- = oo (1 over zero is infinity; we all learned that a
0 long time ago)
-10 = 8 (Counter clockwise rotation. Imagine rotating the
lhs and rhs of the previous equation on its approx.
center point 90 degrees counter clockwise)
-18 = 0 (Subtract eight from both sides)
1
--- = 0 (Clockwise rotation) Q.E.D.
oo
Author unknown.
