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Proof step 5 from proof validref-levelsubset (previous step)

level⊆(str, str0), st[r -- _type] .type ≤ ty ⊦ r = jvmref, validref(str0, r, ty, st), junkref(str, r, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ validref(str, r, ty, st) ↔ r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st)
Proof step 4:
⊦ level⊆(str, str0) ∧ ¬ junkref(str, r, st) → (junkref(str0, r, st) ↔ false)

Rule argument

[crewrite-arg: validref-def, F, [st, ty, r, str] → [st, ty, r, str0]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, ty, r, str0)]]