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(** ** Propositional extensionality and provable proposition extensionality *)

(* Specifications: *)
Lemma PropExt_imp_ProvPropExt : PropositionalExtensionality -> ProvablePropositionExtensionality.
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(** ** Propositional extensionality and refutable proposition extensionality *)
Lemma PropExt_imp_RefutPropExt : PropositionalExtensionality -> RefutablePropositionExtensionality.