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diff --git a/matita/matita/contribs/lambdadelta/basic_2/reducibility/lfpr_cpr.ma b/matita/matita/contribs/lambdadelta/basic_2/reducibility/lfpr_cpr.ma
index 2a40f58bd..04686f960 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/reducibility/lfpr_cpr.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/reducibility/lfpr_cpr.ma
@@ -18,12 +18,12 @@ include "basic_2/reducibility/lfpr.ma".
 
 (* FOCALIZED PARALLEL REDUCTION FOR LOCAL ENVIRONMENTS **********************)
 
-(* Advanced properties ****************************************************)
+(* Advanced properties ******************************************************)
 
 lemma lfpr_pair_cpr: ∀L1,L2. ⦃L1⦄ ➡ ⦃L2⦄ → ∀V1,V2. L2 ⊢ V1 ➡ V2 →
                      ∀I. ⦃L1. ⓑ{I} V1⦄ ➡ ⦃L2. ⓑ{I} V2⦄.
 #L1 #L2 * #L #HL1 #HL2 #V1 #V2 *
 <(ltpss_sn_fwd_length … HL2) #V #HV1 #HV2 #I
 lapply (ltpss_sn_tpss_trans_eq … HV2 … HL2) -HV2 #V2
-@(ex2_1_intro … (L.ⓑ{I}V)) /2 width=1/ (**) (* explicit constructor *)
+@(ex2_intro … (L.ⓑ{I}V)) /2 width=1/ (**) (* explicit constructor *)
 qed.