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Proof step 17 from proof multi-in-other (previous step)

1 + # refs1 = i→n(countrefs(i1 ' + ints1)), r -- sk ∈ addmultiarrays (r1 ' + firstn(i→n(i2) * # refs1 + i→n(i2), refs2), i2, r0 ' + acc, ty, i0 ' + i1 ' + ints1, addmultiarrays(r0 ' + refs1, i1, [], ty, i1 ' + ints1, st)) ↔ r -- sk ∈ addmultiarrays(r0 ' + refs1, i1, [], ty, i1 ' + ints1, st), lastn(1 + # refs1, r1 ' + refs2) = r0 ' + refs1, # refs2 = 1 + # refs1 + i→n(i2) * # refs1 + i→n(i2), 0 ≤ i2, i2 < i0, 0 < i0, 0 ≤ i1, posints(ints1), # refs1 ≤ # refs2, r ∈ refs1, ∀ st, ty, acc, sk, ints, i, r, refs0. # refs0 < # (r1 + refs2) → ( true → ( ¬ r ∈ refs0 ∧ # refs0 = i→n(countrefs(i ' + ints .rest)) ∧ ints ≠ [] ∧ 0 ≤ i ∧ posints(ints) ∧ ¬ 0 ∈ ints .butlast ∧ i ≤ ints .first → (r -- sk ∈ addmultiarrays(refs0, i, acc, ty, ints, st) ↔ r -- sk ∈ st))) ⊦ r = r1, (~1) = i2, 0 = i0, r -- sk ∈ addmultiarrays(r0 ' + refs1, i1, [], ty, i1 ' + ints1, st) ↔ r -- sk ∈ st, r ∈ refs2, 0 ∈ (i1 ' + ints1) .butlast

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[speclemmaarg: ,n ≤ # refs ∧ r ∈ refs0 ∧ ¬ r ∈ refs → lastn(n, refs) ≠ r0 ' + refs0 ,[r, refs0, r0, refs, n] → [r, refs1, r0, r1 ' + refs2, 1 + # refs1] ,F ,list-del ,references ,lastn-neq-01 ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ # (refs + refs0) = # refs + # refs0], [CSIMPSEQ : ⊦ # r ' = 0 +1], [CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1], [CSIMPSEQ : ⊦ m + n ≤ m + n0 ↔ n ≤ n0], [CSIMPSEQ : ⊦ ¬ m ≤ n ↔ n < m], [CSIMPSEQ : ⊦ m ≤ n → (n < m ↔ false)], [CSIMPSEQ : ⊦ (m + n0) + n1 = m + n0 + n1], [CSIMPSEQ : ⊦ m + n = n + m], [CSIMPSEQ : ⊦ r ≠ r0 → (r ∈ r0 ' + refs ↔ r ∈ refs)])], [EXTRATERMS : (r, refs1, r0, r1 ' + refs2, 1 + # refs1)]]