X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fsyntax%2Fcl_weight.ma;h=c4226cd83719a3b74e6f4f6a5cdc6fc423b23cd5;hp=b933688142db4f054d75c44564ddd48c2fceb2ed;hb=222044da28742b24584549ba86b1805a87def070;hpb=09b4420070d6a71990e16211e499b51dbb0742cb

diff --git a/matita/matita/contribs/lambdadelta/basic_2/syntax/cl_weight.ma b/matita/matita/contribs/lambdadelta/basic_2/syntax/cl_weight.ma
index b93368814..c4226cd83 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/syntax/cl_weight.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/syntax/cl_weight.ma
@@ -30,6 +30,10 @@ lemma fw_shift: ∀p,I,G,K,V,T. ♯{G, K.ⓑ{I}V, T} < ♯{G, K, ⓑ{p,I}V.T}.
 normalize /2 width=1 by monotonic_le_plus_r/
 qed.
 
+lemma fw_clear: ∀p,I1,I2,G,K,V,T. ♯{G, K.ⓤ{I1}, T} < ♯{G, K, ⓑ{p,I2}V.T}.
+normalize /4 width=1 by monotonic_le_plus_r, le_S_S/
+qed.
+
 lemma fw_tpair_sn: ∀I,G,L,V,T. ♯{G, L, V} < ♯{G, L, ②{I}V.T}.
 normalize in ⊢ (?→?→?→?→?→?%%); //
 qed.