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Proof step 7 from proof instfields-subclass-01 (previous step)

class0 ≤ class, sk ∈ instfields(class) ⊦ is_fskey(sk), sk ∈ instfields(class0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
class0 ≤ class, sk ∈ instfields(class), is_indexkey(sk) ⊦ sk ∈ instfields(class0)

Rule argument

[emptyarg]

Additional information

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