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Proof step 15 from proof is_obj-field-norefval (conclusion)

⊦ ¬ is_referencevalue(st[r -- fs ']) ∧ is_reftype(fs .type) ∧ fs ' ∈ instfields(class) ∧ st[r -- _type] .type = mkclasstype(class) → ¬ is_obj(str, r, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 1:
⊦ is_obj(str, r, st) ↔ class+∃(str, st[r -- _type] .type .class) ∧ ¬ is_abstract(st[r -- _type] .type .class) ∧ is_obj(r, st)
Proof step 14:
st[r -- _type] .type = mkclasstype(class), fs ' ∈ instfields(class), is_reftype(fs .type), is_obj(r, st), class+∃(str, class) ⊦ is_referencevalue(st[r -- fs ']), is_abstract(class)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkclasstype(class) .class = class])]]