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Proof step 2 from proof okarrays-one (conclusion)

⊦ okarrays(r, (sk × val) ', st) ↔ is_integervalue(val) ∧ is_fskey(sk) ∧ is_arraytype(sk .fs .type) ∧ okarray(st[r -- sk], sk .fs .type .type, val .intval, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 1:
⊦ okarrays(r, (sk × val) ', st) ↔ ¬ ¬ (is_integervalue(val) ∧ is_fskey(sk) ∧ is_arraytype(sk .fs .type) ∧ okarray(st[r -- sk], sk .fs .type .type, val .intval, st))

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_indexkey(sk) → ¬ is_fskey(sk)], [CSIMPSEQ : ⊦ ¬ is_fskey(sk) ↔ is_indexkey(sk)])]]