fact: Definition lambda_calculus_rect_subst {L : lambda_calculus} {A f_var f_app f_abs f_subst f_paths m n} l f : lambda_calculus_rect (L := L) A f_var f_app f_abs f_subst f_paths n (subst l f) = f_subst m n (lambda_calculus_rect _ f_var f_app f_abs f_subst f_paths _ l) (λ i, lambda_calculus_rect _ f_var f_app f_abs f_subst f_paths _ (f i)) := lambda_calculus_ind_subst l f.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.Combinatorics.StandardFiniteSets UniMath.Combinatorics.Tuples