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Proof step 5 from proof getarray-in-01 (previous step)

i0 ≤ i, i < i0 + i3, st[r -- i '] ∈ getarray(r, i0, i3, st), 0 < i3, ∀ st, i0, r, val, i. i→n(i) < i→n(i3 + 1) → (val ∈ getarray(r, i0, i, st) ∧ 0 < i → (∃ i2. ¬ i2 < i0 ∧ ¬ i0 + i ≤ i2 ∧ st[r -- i2 '] = val)) ⊦ ∃ i1. ¬ i1 < i0 ∧ ¬ i0 + i3 < i1 ∧ st[r -- i1 '] = st[r -- i ']

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

[EXRARG : pos: right 1, [QUANTTERMLIST : (i)]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ i ≤ j → (¬ ¬ j < i ↔ false)], [CSIMPSEQ : ⊦ i + j = j + i], [CSIMPSEQ : ⊦ i < j → ¬ j < i])], [EXTRATERMS : (i)]]