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

st[r -- _type] .type ≤ ty, st ⊆ st1 ⊦ r = jvmref, junkref(str, r, st), st1[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st1)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ rk ∈ st ∧ st ⊆ st1 → st1[rk] = st[rk]
Proof step 5:
⊦ ¬ r -- _type ∈ st → (junkref(str, r, st) ↔ r ≠ jvmref)
Proof step 8:
r -- _type ∈ st ∧ st ⊆ st1, st[r -- _type] .type ≤ ty, st ⊆ st1 ⊦ r = jvmref, junkref(str, r, st), st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st1)

Rule argument

[speclemmaarg: ,rk ∈ st ∧ st ⊆ st1 → st1[rk] = st[rk] ,[rk, st, st1] → [r -- _type, st, st1] ,F ,store ,javastore-ostorea ,superset-elem-eq ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ rk ∈ st → st[rk] = ∅[rk]], [CSIMPSEQ : ⊦ ∅[rk] = noval])], [EXTRATERMS : (r -- _type, st, st1)]]