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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs_cnr.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs_cnr.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+include "basic_2/rt_transition/cnr.ma".
+include "basic_2/rt_computation/cprs.ma".
+
+(* CONTEXT-SENSITIVE PARALLEL R-COMPUTATION FOR TERMS ***********************)
+
+(* Inversion lemmas with normal terms for r-transition **********************)
+
+(* Basic_1: was: nf2_pr3_unfold *)
+(* Basic_2A1: was: cprs_inv_cnr1 *)
+lemma cprs_inv_cnr_sn (h) (G) (L):
+      ∀T1,T2. ⦃G,L⦄ ⊢ T1 ➡*[h] T2 → ⦃G,L⦄ ⊢ ➡[h] 𝐍⦃T1⦄ → T1 = T2.
+#h #G #L #T1 #T2 #H @(cprs_ind_sn … H) -T1 //
+#T1 #T0 #HT10 #_ #IH #HT1
+lapply (HT1 … HT10) -HT10 #H destruct /2 width=1 by/
+qed-.