(* RANGED EQUIVALENCE FOR LOCAL ENVIRONMENTS ********************************)
(* Main properties **********************************************************)
theorem lreq_trans: ∀f. Transitive … (lreq f).
(* RANGED EQUIVALENCE FOR LOCAL ENVIRONMENTS ********************************)
(* Main properties **********************************************************)
theorem lreq_trans: ∀f. Transitive … (lreq f).
theorem lreq_canc_sn: ∀f. left_cancellable … (lreq f).
/3 width=3 by lexs_canc_sn, lreq_trans, lreq_sym/ qed-.
theorem lreq_canc_sn: ∀f. left_cancellable … (lreq f).
/3 width=3 by lexs_canc_sn, lreq_trans, lreq_sym/ qed-.