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Proof step 7 from proof validref-subset (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 6:
⊦ ¬ junkref(str, r, st) ∧ st ⊆ st1 → ¬ junkref(str, r, st1)

Rule argument

[crewrite-arg: junkref-subset , F , [str, r, st, st1] → [str, r, st, st1] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (str, r, st, st1)]]