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Proof step 4 from proof addarrays-fieldat (
previous step
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⊦ fs ' ≠ _type ∧ fs ' ≠ _length ∧ # refs = i→n(countrefs(i ' + ints .rest)) ∧ ints ≠ [] ∧ 0 ≤ i ∧ posints(ints) ∧ ¬ 0 ∈ ints .butlast ∧ i ≤ ints .first → (addmultiarrays(refs, i, acc, ty, ints, st)[r -- fs ']) = st[r -- fs ']
Lemma
multi-field