Four is equal to five
Theorem： 4 = 5
Proof：
-20 = -20
16 - 36 = 25 - 45
4^2 - 9*4 = 5^2 - 9*5
4^2 - 9*4 + 81/4 = 5^2 - 9*5 + 81/4
（4 - 9/2）^2 = （5 - 9/2）^2
4 - 9/2 = 5 - 9/2
4 = 5
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