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Proof step 20 from proof getarray-in (previous step)

i < st[r -- _length] .intval, 0 ≤ i, 0 < st[r -- _length] .intval ⊦ ∃ n. ¬ # getarray(r, st) ≤ n ∧ st[r -- n→i(n) '] = st[r -- i ']

User applied rule exists right

And obtained the following new goals

Proof step 19:
i < st[r -- _length] .intval, 0 ≤ i, 0 < st[r -- _length] .intval ⊦ ¬ # getarray(r, st) ≤ i→n(i) ∧ st[r -- n→i(i→n(i)) '] = st[r -- i ']

Rule argument

[EXRARG : pos: right 1, [extquanttermlist: (i→n(i))abort:F, discard:T, computed:F]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (i→n(i))]]