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Proof step 4 from proof unchanged-array-forward (previous step)

st[r -- i '] = refval(r0), is_valid_ref(str, r0, st), st[r0 -- _type] .type ≤ st[r -- _type] .type .type, 0 < st[r -- _length] .intval, 0 ≤ i, is_array(str, r, st), i < st[r -- _length] .intval, unchanged(str, r, st, st1) ⊦ r0 = jvmref, r = jvmref, r = r0, unchanged(str, r0, st, st1), ∃ i0. ¬ i0 < 0 ∧ ¬ st[r -- _length] .intval ≤ i0 ∧ is_referencevalue(st[r -- i0 ']) ∧ st[r -- i0 '] .refval ≠ jvmref ∧ st[st[r -- i0 '] .refval -- _type] .type ≤ st[r -- _type] .type .type ∧ path∃(str, st[r -- i0 '] .refval, r0, st)

User applied rule exists right

And closed the goal!

Rule argument

[EXRARG : pos: right 5, [extquanttermlist: (i)abort:F, discard:T, computed:T]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ i ≤ j → (¬ ¬ j < i ↔ false)], [CSIMPSEQ : ⊦ i < j → (¬ ¬ j ≤ i ↔ false)], [CSIMPSEQ : ⊦ is_referencevalue(refval(r))], [CSIMPSEQ : ⊦ refval(r) .refval = r], [CSIMPSEQ : ⊦ path∃(str, r, r, st) ↔ r = jvmref ∨ r ≠ jvmref ∧ is_valid_ref(str, r, st)])], [EXTRATERMS : (i)]]