(* Properties with degree-based equivalence for terms ***********************)
-lemma tdeq_theq: â\88\80h,o,T1,T2. T1 â\89¡[h, o] T2 → T1 ⩳[h, o] T2.
+lemma tdeq_theq: â\88\80h,o,T1,T2. T1 â\89\9b[h, o] T2 → T1 ⩳[h, o] T2.
#h #o #T1 #T2 * -T1 -T2 /2 width=3 by theq_sort, theq_pair/
qed.