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Proof step 7 from proof is_arrayref-03 (previous step)

is_arrayref(r, i, st) ⊦ is_arrayref(r, i, st[r -- j ', val])

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ is_arrayref(r, i, st) ↔ (∀ j. 0 ≤ j ∧ j < i → r -- j ' ∈ st)
Proof step 6:
is_arrayref(r, i, st) ⊦ ∀ j0. 0 ≤ j0 ∧ j0 < i → r -- j0 ' ∈ st[r -- j ', val]

Rule argument

[crewrite-arg: is_arrayref, F, [st, i, r] → [st[r -- j ', val], i, r]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st[r -- j ', val], i, r)]]