lemma cpxs_inv_cnx1 (h) (G) (L):
∀T1,T2. ⦃G,L⦄ ⊢ T1 ⬈*[h] T2 → ⦃G,L⦄ ⊢ ⬈[h] 𝐍⦃T1⦄ → T1 ≛ T2.
#h #G #L #T1 #T2 #H @(cpxs_ind_dx … H) -T1
lemma cpxs_inv_cnx1 (h) (G) (L):
∀T1,T2. ⦃G,L⦄ ⊢ T1 ⬈*[h] T2 → ⦃G,L⦄ ⊢ ⬈[h] 𝐍⦃T1⦄ → T1 ≛ T2.
#h #G #L #T1 #T2 #H @(cpxs_ind_dx … H) -T1