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Theorem unchanged-class-forward

⊦ unchanged(str, r, st, st1) ∧ sk ∈ instfields(st[r -- _type] .type .class) ∧ is_obj(str, r, st) ∧ is_referencevalue(st[r -- sk]) ∧ r ≠ jvmref ∧ (st[r -- sk] .refval ≠ jvmref → st[st[r -- sk] .refval -- _type] .type ≤ sk .fs .type ∧ is_valid_ref(str, st[r -- sk] .refval, st)) → unchanged(str, st[r -- sk] .refval, st, st1)

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: unchanged-junkrefs, unchanged-junkrefs-level, unchanged-rec-generic,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 4
Proof steps: 13
Used lemmas: unchanged-null, unchanged-pathex-unchanged,
Used spec theorems:
- cyclic/pathex-class
Used simplifier rules: