Prove the princple of explosion: Theorem ex_falso_quodlibet : forall (P:Prop), False -> P. are trying to prove a goal that is nonsensical (e.g., the goal state is false = true), apply ex_falso_quodlibet Since reasoning with ex_falso_quodlibet is quite common, Coq provides a built-in tactic, exfalso, for
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