fact: Definition lambda_calculus_rect_app {L : lambda_calculus} {A f_var f_app f_abs f_subst f_paths n} l l' : lambda_calculus_rect (L := L) A f_var f_app f_abs f_subst f_paths n (app l l') = f_app _ (lambda_calculus_rect _ f_var f_app f_abs f_subst f_paths _ l) (lambda_calculus_rect _ f_var f_app f_abs f_subst f_paths _ l') := lambda_calculus_ind_app l l'.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.Combinatorics.StandardFiniteSets UniMath.Combinatorics.Tuples