What is wrong with this reasoning?
Proof That Five Equals Four
-20 = -20
25 – 45 = 16 – 36
52 – 45 = 42 – 36
52 – 45 + 81/4 = 42 – 36 + 81/4
(5 – 9/2)2 = (4 – 9/2)2
5 – 9/2 = 4 – 9/2
5 = 4
From Futility Closet. He also links to three other purported "proofs", all of which are interesting but whose logic is easy to refute. This one stumps me though. Let me sleep on it.
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