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Proof step 2 from proof instfields-subclass-in (previous step)

ty = mkclasstype(class0), is_classtype(ty), ty ≤ mkclasstype(class), fs ' ∈ instfields(class) ⊦ fs ' ∈ instfields(class0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 1:
⊦ fs ' ∈ instfields(class) ∧ class0 ≤ class → fs ' ∈ instfields(class0)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkclasstype(class1) ≤ mkclasstype(class2) ↔ class1 ≤ class2], [CSIMPSEQ : ⊦ is_classtype(mkclasstype(class))])]]