(* Properties with shift ****************************************************)
-lemma max_shift: â\88\80c1,c2. ((â\86\93c1) â\88¨ (â\86\93c2)) = â\86\93(c1∨c2).
+lemma max_shift: â\88\80c1,c2. ((â\86\95*c1) â\88¨ (â\86\95*c2)) = â\86\95*(c1∨c2).
* #ri1 #rs1 #ti1 #ts1 * #ri2 #rs2 #ti2 #ts2
<shift_rew <shift_rew <shift_rew <max_rew //
qed.