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(¬ A ∧ ¬ B) → ¬ (A ∨ B) prove of this example on lean language.

Posted: Sat May 14, 2022 7:48 pm
by answerhappygod
(¬ A ∧ ¬ B) → ¬ (A ∨ B) prove of this example on lean language.