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Proof step 14 from proof validfield-levelsubset (previous step)

level⊆(str, str0), validfield(str, r, sk, st) ⊦ validfield(str0, r, sk, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ validfield(str, r, sk, st) ↔ goodfieldandtype(r, sk, st) ∧ type∃(str, sk .fs .type) ∧ sk .fs .type ≠ void_type ∧ (is_reftype(sk .fs .type) → validrefval(str, st[r -- sk], sk .fs .type, st))
Proof step 13:
level⊆(str, str0), goodfieldandtype(r, sk, st) ∧ type∃(str, sk .fs .type) ∧ sk .fs .type ≠ void_type ∧ (is_reftype(sk .fs .type) → validrefval(str, st[r -- sk], sk .fs .type, st)) ⊦ validfield(str0, r, sk, st)

Rule argument

[crewrite-arg: validfield-def, F, [st, sk, r, str] → [st, sk, r, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, sk, r, str)]]