X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fdynamic%2Fcnv_fsb.ma;h=763faf1d934f6079215debbf429de48e82f0610a;hb=6b4da5fa47d474dcf2f203ec7f5ed36938739c9b;hp=46c1255d6e0b6cd1445749de2b545e342a9560ae;hpb=bd840d43d09254b41936c49fc447e58582b156eb;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_fsb.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_fsb.ma
index 46c1255d6..763faf1d9 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_fsb.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_fsb.ma
@@ -24,6 +24,13 @@ lemma cnv_fwd_fsb (a) (h): ∀G,L,T. ⦃G, L⦄ ⊢ T ![a, h] → ≥[h] 𝐒⦃
 #a #h #G #L #T #H elim (cnv_fwd_aaa … H) -H /2 width=2 by aaa_fsb/
 qed-.
 
+(* Forward lemmas with strongly rt-normalizing terms ************************)
+
+lemma cnv_fwd_csx (a) (h): ∀G,L,T. ⦃G,L⦄ ⊢ T ![a,h] → ⦃G, L⦄ ⊢ ⬈*[h] 𝐒⦃T⦄.
+#a #h #G #L #T #H
+/3 width=2 by cnv_fwd_fsb, fsb_inv_csx/
+qed-.
+
 (* Inversion lemmas with proper parallel rst-computation for closures *******)
 
 lemma cnv_fpbg_refl_false (a) (h) (G) (L) (T):