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Proof step 8 from proof instfields-subclass-01 (previous step)

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

User applied rule cut formula

And obtained the following new goals

Proof step 3:
is_fskey(sk), class0 ≤ class, sk ∈ instfields(class) ⊦ sk ∈ instfields(class0)
Proof step 7:
class0 ≤ class, sk ∈ instfields(class) ⊦ is_fskey(sk), sk ∈ instfields(class0)

Rule argument

[fma-arg: is_fskey(sk)]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRAFMAS : (is_fskey(sk))]]