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Proof step 5 from proof gft-not-01 (previous step)

¬ is_fskey(sk), oktype(val, ty, st), goodfieldandtype(r, sk, st) ⊦ mkfs(class0, ty, fieldvar) ' = _type, goodfieldandtype(r, sk, st[r0 -- mkfs(class0, ty, fieldvar) ', val])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
oktype(val, ty, st), goodfieldandtype(r, sk, st), is_indexkey(sk) ⊦ mkfs(class0, ty, fieldvar) ' = _type, goodfieldandtype(r, sk, st[r0 -- mkfs(class0, ty, fieldvar) ', val])

Rule argument

[emptyarg]

Additional information

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