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Proof step 9 from proof validref-subset-01 (previous step)

st ⊆ st0, st0[r -- _type] .type ≤ ty ⊦ r = jvmref, junkref(str, r, st), validref(str, r, ty, st), junkref(str, r, st0)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ validref(str, r, ty, st) ↔ r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st)
Proof step 8:
st ⊆ st0, st0[r -- _type] .type ≤ ty ⊦ r = jvmref, junkref(str, r, st), r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st), junkref(str, r, st0)

Rule argument

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

Additional information

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