-lemma cprs_delta: ∀L,K,V,V2,i.
- â\87©[0, i] L â\89¡ K. â\93\93V â\86\92 K ⊢ V ➡* V2 →
- â\88\80W2. â\87§[0, i + 1] V2 â\89¡ W2 â\86\92 L ⊢ #i ➡* W2.
-#L #K #V #V2 #i #HLK #H elim H -V2 [ /3 width=6/ ]
+lemma cprs_delta: ∀G,L,K,V,V2,i.
+ â¬\87[i] L â\89¡ K.â\93\93V â\86\92 â¦\83G, Kâ¦\84 ⊢ V ➡* V2 →
+ â\88\80W2. â¬\86[0, i + 1] V2 â\89¡ W2 â\86\92 â¦\83G, Lâ¦\84 ⊢ #i ➡* W2.
+#G #L #K #V #V2 #i #HLK #H elim H -V2 [ /3 width=6 by cpr_cprs, cpr_delta/ ]