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diff --git a/matita/matita/contribs/lambdadelta/basic_2/unfold/unfold.ma b/matita/matita/contribs/lambdadelta/basic_2/unfold/unfold.ma
index 160c6da76..8ecf927a4 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/unfold/unfold.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/unfold/unfold.ma
@@ -15,15 +15,15 @@
 include "basic_2/notation/relations/unfold_4.ma".
 include "basic_2/grammar/lenv_append.ma".
 include "basic_2/grammar/genv.ma".
-include "basic_2/relocation/ldrop.ma".
+include "basic_2/substitution/drop.ma".
 
 (* CONTEXT-SENSITIVE UNFOLD FOR TERMS ***************************************)
 
 (* activate genv *)
 inductive unfold: relation4 genv lenv term lenv ≝
 | unfold_sort: ∀G,L,k. unfold G L (⋆k) L
-| unfold_lref: ∀I,G,L1,L2,K1,K2,V,i. ⇩[0, i] L1 ≡ K1. ⓑ{I}V →
-               unfold G K1 V K2 → ⇩[|L2|, i] L2 ≡ K2 →
+| unfold_lref: ∀I,G,L1,L2,K1,K2,V,i. ⬇[i] L1 ≡ K1. ⓑ{I}V →
+               unfold G K1 V K2 → ⬇[Ⓣ, |L2|, i] L2 ≡ K2 →
                unfold G L1 (#i) (L1@@L2)
 | unfold_bind: ∀a,I,G,L1,L2,V,T.
                unfold G (L1.ⓑ{I}V) T L2 → unfold G L1 (ⓑ{a,I}V.T) L2