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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbs_cpx.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbs_cpx.ma
index 536e532a4..5127496b1 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbs_cpx.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbs_cpx.ma
@@ -18,13 +18,14 @@ include "basic_2/rt_computation/fpbs_lpxs.ma".
 
 (* PARALLEL RST-COMPUTATION FOR CLOSURES ************************************)
 
-(* Properties with unbound context-sensitive parallel rt-transition *********)
+(* Properties with extended context-sensitive parallel rt-transition ********)
 
 (* Basic_2A1: uses: fpbs_cpx_trans_neq *)
-lemma fpbs_cpx_tneqx_trans: ∀h,G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ≥[h] ❪G2,L2,T2❫ →
-                            ∀U2. ❪G2,L2❫ ⊢ T2 ⬈[h] U2 → (T2 ≛ U2 → ⊥) →
-                            ∃∃U1. ❪G1,L1❫ ⊢ T1 ⬈[h] U1 & T1 ≛ U1 → ⊥ & ❪G1,L1,U1❫ ≥[h] ❪G2,L2,U2❫.
-#h #G1 #G2 #L1 #L2 #T1 #T2 #H #U2 #HTU2 #HnTU2
+lemma fpbs_cpx_tneqx_trans:
+      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫ →
+      ∀U2. ❪G2,L2❫ ⊢ T2 ⬈ U2 → (T2 ≛ U2 → ⊥) →
+      ∃∃U1. ❪G1,L1❫ ⊢ T1 ⬈ U1 & T1 ≛ U1 → ⊥ & ❪G1,L1,U1❫ ≥ ❪G2,L2,U2❫.
+#G1 #G2 #L1 #L2 #T1 #T2 #H #U2 #HTU2 #HnTU2
 elim (fpbs_inv_star … H) -H #G0 #L0 #L3 #T0 #T3 #HT10 #H10 #HL03 #H32
 elim (feqx_cpx_trans … H32 … HTU2) -HTU2 #T4 #HT34 #H42
 lapply (feqx_tneqx_repl_dx … H32 … H42 … HnTU2) -T2 #HnT34