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Ssnow reacted to Gavran's post in the thread Undergrad Prove that 1 + NOT (1 + NOT x) = x with
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We can define the function ## f(x)=1+\text{NOT}x ## and prove that ## f^{-1}(x)=f(x) ##. ## \begin{align} f(x)=1+\text{NOT}x&\implies...