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Proof step 11 from proof validfield-one (conclusion)

⊦ validfield(str, r, sk, st) ↔ is_fskey(sk) ∧ r -- sk ∈ st ∧ type∃(str, sk .fs .type) ∧ sk .fs .type ≠ void_type ∧ validval(str, st[r -- sk], sk .fs .type, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 10:
⊦ validfield(str, r, sk, st) ↔ ¬ is_indexkey(sk) ∧ r -- sk ∈ st ∧ type∃(str, sk .fs .type) ∧ sk .fs .type ≠ void_type ∧ validval(str, st[r -- sk], sk .fs .type, st)

Rule argument

[emptyarg]

Additional information

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