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Theorem validref-class-rec-better-keep

⊦ is_obj(str, r, st) → ( validref(str, r, ty, st) ↔ validref(str, r, ty, st) ∧ st[r -- _type] .type ≤ ty ∧ ¬ (∃ fs. fs ' ∈ instfields(st[r -- _type] .type .class) ∧ is_referencevalue(st[r -- fs ']) ∧ st[r -- fs '] .refval ≠ jvmref ∧ (¬ st[st[r -- fs '] .refval -- _type] .type ≤ fs .type ∨ ¬ validref(str, st[r -- fs '] .refval, fs .type, st))))

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by:
Used by units in proved state:
Proof exists?: Yes

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Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 8
Used lemmas: validref-class-rec-better,
Used spec theorems:
- Used simplifier rules: