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diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc/csup/csup_csup.etc b/matita/matita/contribs/lambdadelta/basic_2/etc/csup/csup_csup.etc
index 813cb969d..661d89697 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/etc/csup/csup_csup.etc
+++ b/matita/matita/contribs/lambdadelta/basic_2/etc/csup/csup_csup.etc
@@ -17,22 +17,6 @@ include "basic_2/substitution/csup.ma".
 
 (* SUPCLOSURE ***************************************************************)
 
-(* Advanced inversion lemmas ************************************************)
-
-lemma csup_inv_ldrop: ∀L1,L2,T1,T2. ⦃L1, T1⦄ > ⦃L2, T2⦄ →
-                      ∀J,W,j. ⇩[0, j] L1 ≡ L2.ⓑ{J}W → T1 = #j ∧ T2 = W.
-#L1 #L2 #T1 #T2 * -L1 -L2 -T1 -T2
-[ #I #L #K #V #i #HLKV #J #W #j #HLKW
-  elim (ldrop_conf_div … HLKV … HLKW) -L /2 width=1/
-| #a
-| #a
-]
-#I #L #V #T #J #W #j #H
-lapply (ldrop_pair2_fwd_cw … H W) -H #H
-[2: lapply (transitive_lt (#{L,W}) … H) /2 width=1/ -H #H ]
-elim (lt_refl_false … H)
-qed-.
-
 (* Main forward lemmas ******************************************************)
 
 theorem csup_trans_fwd_refl: ∀L,L0,T1,T2. ⦃L, T1⦄ > ⦃L0, T2⦄ →