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Line 1: − The last example is circular (the first three statements simplify to "if P then P"). The first three examples are not circular in the slightest! − "one assumes the fact that one is trying to prove". Take the first example, in that you have assumed: − − 1. If P then Q and − 2. P − − If one were trying to establish P the argument would be circular, but one isn't - the conclusion is "Q" which does not form one of the assumptions.--[[User:Toffeeman|Toffeeman]] 18:01, 26 March 2007 (EDT)
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