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diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_cpce_etc.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_cpce_etc.ma
deleted file mode 100644
index 861161f21..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_cpce_etc.ma
+++ /dev/null
@@ -1,30 +0,0 @@
-include "basic_2/dynamic/cnv_cpce.ma".
-
-lemma pippo (h) (a) (G) (L0):
-      ∀T0. ⦃G,L0⦄ ⊢ T0 ![h,a] →
-      ∀n,T1. ⦃G,L0⦄ ⊢ T0 ➡[n,h] T1 → ∀T2. ⦃G,L0⦄ ⊢ T0 ⬌η[h] T2 →
-      ∀L1. ⦃G,L0⦄ ⊢ ➡[h] L1 →
-      ∃∃T. ⦃G,L1⦄ ⊢ T1 ⬌η[h] T & ⦃G,L0⦄ ⊢ T2 ➡[n,h] T. 
-#h #a #G #L0 * *
-[ #s #_ #n #X1 #HX1 #X2 #HX2 #L1 #HL01
-  elim (cpm_inv_sort1 … HX1) -HX1 #H #Hn destruct
-  lapply (cpce_inv_sort_sn … HX2) -HX2 #H destruct
-  /3 width=3 by cpce_sort, cpm_sort, ex2_intro/
-| #i #_ #n #X1 #HX1 #X2 #HX2 #L1 #HL01
-  elim (drops_F_uni L0 i)
-  [
-  | *    
-
-(*
-lemma cpce_inv_eta_drops (h) (n) (G) (L) (i):
-      ∀X. ⦃G,L⦄ ⊢ #i ⬌η[h] X →
-      ∀K,W. ⇩*[i] L ≘ K.ⓛW →
-      ∀p,V1,U. ⦃G,K⦄ ⊢ W ➡*[n,h] ⓛ{p}V1.U →
-      ∀V2. ⦃G,K⦄ ⊢ V1 ⬌η[h] V2 →
-      ∀W2. ⇧*[↑i] V2 ≘ W2 → X = +ⓛW2.ⓐ#0.#↑i.
-
-theorem cpce_mono_cnv (h) (a) (G) (L):
-        ∀T. ⦃G,L⦄ ⊢ T ![h,a] →
-        ∀T1. ⦃G,L⦄ ⊢ T ⬌η[h] T1 → ∀T2. ⦃G,L⦄ ⊢ T ⬌η[h] T2 → T1 = T2.
-#h #a #G #L #T #HT
-*)