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Proof of Principle of Duality: Show that $φ$' is logically equivalent to $¬φ$
Could anyone check if my proof is ok/ suggest any improvement please? I couldn't find a way to utilise the induction hypothesis so I am not sure if this is ok.
Let $φ$ be a formula built up using ...
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Changing conjunction and disjunction in equivalent boolean functions.
I have some difficulties to prove that if two equivalent boolean functions contain only ∧, ∨ and $\neg$ than we can change ∧ to ∨ and vice versa and the result functions will remain equivalent.
There'...
