Instance TraverseVarIsIdentity_my_value_my_value : @TraverseVarIsIdentity my_value _ my_value _.Instance TraverseVarIsIdentity_my_value_my_term : @TraverseVarIsIdentity my_value _ my_term _.

Lemma subst_MyVAbs: forall v k t, subst v k (MyVAbs t) = MyVAbs (subst (shift 0 v) (1 + k) t).