(* Properies with simple (neutral) terms ************************************)
(* Basic_2A1: was: simple_tsts_repl_dx *)
-lemma simple_teqo_repl_dx: âT1,T2. T1 â©ł T2 â đâȘT1â« â đâȘT2â«.
+lemma simple_teqo_repl_dx: âT1,T2. T1 ~ T2 â đâȘT1â« â đâȘT2â«.
#T1 #T2 * -T1 -T2 //
#I #V1 #V2 #T1 #T2 #H
elim (simple_inv_pair ⊠H) -H #J #H destruct //
qed-.
(* Basic_2A1: was: simple_tsts_repl_sn *)
-lemma simple_teqo_repl_sn: âT1,T2. T1 â©ł T2 â đâȘT2â« â đâȘT1â«.
+lemma simple_teqo_repl_sn: âT1,T2. T1 ~ T2 â đâȘT2â« â đâȘT1â«.
/3 width=3 by simple_teqo_repl_dx, teqo_sym/ qed-.