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Proof step 7 from proof del-notin-01 (previous step)

⊦ (st -- r0)[r0 -- sk] = ∅[r0 -- sk], r0 ∈ st, r0 -- sk ∈ st

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ ¬ rk ∈ st → st[rk] = ∅[rk]
Proof step 6:
⊦ r -- sk ∈ st -- r0 ↔ r ≠ r0 ∧ r -- sk ∈ st

Rule argument

[speclemmaarg: ,¬ rk ∈ st → st[rk] = ∅[rk] ,[rk, st] → [r0 -- sk, st -- r0] ,F ,store ,javastore ,notmemlookup ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r0 -- sk, st -- r0)]]