AC.con.body.xml AC.con.types.xml guarded_rel_choice.con.body.xml guarded_rel_choice.con.types.xml pred_ext_and_rel_choice_imp_EM.con.body.xml pred_ext_and_rel_choice_imp_EM.con.types.xml PredExt_GuardRelChoice_imp_EM/ PredicateExtensionality.con.body.xml PredicateExtensionality.con.types.xml proof_irrel.con.body.xml proof_irrel.con.types.xml prop_ext.con.body.xml prop_ext.con.types.xml