-lemma lsxa_intro_lpx: ∀h,g,G,L1,T,d.
- (∀L2. ⦃G, L1⦄ ⊢ ➡[h, g] L2 → (L1 ≡[T, d] L2 → ⊥) → G ⊢ ⬊⬊*[h, g, T, d] L2) →
- G ⊢ ⬊⬊*[h, g, T, d] L1.
-#h #g #G #L1 #T #d #IH @lsxa_intro_aux
+lemma lsxa_intro_lpx: ∀h,g,G,L1,T,l.
+ (∀L2. ⦃G, L1⦄ ⊢ ➡[h, g] L2 → (L1 ≡[T, l] L2 → ⊥) → G ⊢ ⬊⬊*[h, g, T, l] L2) →
+ G ⊢ ⬊⬊*[h, g, T, l] L1.
+#h #g #G #L1 #T #l #IH @lsxa_intro_aux