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| Numbers equal zero | 
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 | Theorem : All numbers are equal to zero. 
 Proof: Suppose that a=b. Then
 a = b
 a^2 = ab
 a^2 - b^2 = ab - b^2
 (a + b)(a - b) = b(a - b)
 a + b = b
 a = 0
 
 Furthermore if a + b = b, and a = b, then b + b = b, and 2b = b, which mean that 2 = 1.
 
 
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