- init_cache_and_tables rewritten using the automation_cache

[helm.git] / helm / software / matita / library / didactic / exercises / duality.ma

diff --git a/helm/software/matita/library/didactic/exercises/duality.ma b/helm/software/matita/library/didactic/exercises/duality.ma
index aa1aa32f8859e4602b8c8eb186ab7968cdb699a7..28e254f9477726bdcc9fc84e717b74add40d6557 100644 (file)
--- a/helm/software/matita/library/didactic/exercises/duality.ma
+++ b/helm/software/matita/library/didactic/exercises/duality.ma
@@ -220,7 +220,7 @@ definition equiv ≝ λF1,F2. ∀v.[[ F1 ]]_v = [[ F2 ]]_v.
 notation "hvbox(a \nbsp break mstyle color #0000ff (≡) \nbsp b)"  non associative with precedence 45 for @{ 'equivF $a $b }.
 notation > "a ≡ b" non associative with precedence 50 for @{ equiv $a $b }.
 interpretation "equivalence for Formulas" 'equivF a b = (equiv a b).
-lemma equiv_rewrite : ∀F1,F2,F3. F1 ≡ F2 → F1 ≡ F3 → F2 ≡ F3. intros; intro; autobatch. qed.
+lemma equiv_rewrite : ∀F1,F2,F3. F1 ≡ F2 → F1 ≡ F3 → F2 ≡ F3. intros; intro; rewrite < H; rewrite < H1; reflexivity. qed.
 
 (* Esercizio 3
    ===========