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Proof step 7 from proof at-1dim-other (previous step)

is_indexkey(sk), sk .index < 0 ∨ j ≤ sk .index ⊦ (addarray(r0, ty, j, st)[r0 -- sk]) = st[r0 -- sk]

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 6:
sk = i ', is_indexkey(sk), i < 0 ∨ j ≤ i ⊦ (addarray(r0, ty, j, st)[r0 -- sk]) = st[r0 -- sk]

Rule argument

[speclemmaarg: ,is_indexkey(sk) → (i = sk .index ↔ sk = i ') ,[sk, i] → [sk, i] ,T ,storekey , ,elim-04 ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPELIM : ⊦ is_indexkey(sk) → (i = sk .index ↔ sk = i ')])], [EXTRATERMS : (sk, i)]]