Tuesday, April 6, 2010

2 = 1

A friend's Facebook status reminds me of this silly proof of 2 = 1:

a = b
a2 = ab
a2 - b2 = ab - b2
(a + b)(a - b) = b(a - b)
a + b = b
a + a = a (as we suppose a = b in the beginning)
2a = a
2 = 1

:P