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Proof step 4 from proof okarrays-put-02 (previous step)

okarray(st[r -- mkfs(class, ty, fieldvar) '], ty .type, val0 .intval, st), is_arraytype(ty), is_integervalue(val0), is_fskey(sk), ∀ sk0, r1, st0, r2, val0. ¬ is_indexkey(sk0) → sk0 = _type ∨ sk0 = _length ∨ (okarrays(r1, fis0, st0[r2 -- sk0, val0]) ↔ okarrays(r1, fis0, st0)) ∨ sk0 ∈ fis0 ⊦ okarrays(r, fis0, st[r0 -- sk, val]) ↔ okarrays(r, fis0, st), sk = _length, sk = _type, sk = mkfs(class, ty, fieldvar) ', sk ∈ fis0

User applied rule all left

And closed the goal!

Rule argument

[EXRARG : pos: left 5, [extquanttermlist: (sk, r, st, r0, val) abort:F , discard:T , computed:T ]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_indexkey(sk) → ¬ is_fskey(sk)])], [EXTRATERMS : (sk, r, st, r0, val)]]