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Proof step 18 from proof subset-delete (previous step)

¬ r ≠ rk .ref, st[rk] = st0[rk], rk ∈ st, rk ∈ st0 ⊦ r ∈ st, rk ∈ st0 -- r ∧ st0[rk] = (st0 -- r)[rk]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 17:
st[rk] = st0[rk], rk ∈ st, rk ∈ st0 ⊦ rk .ref ∈ st, rk ∈ st0 -- rk .ref ∧ st0[rk] = (st0 -- rk .ref)[rk]

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]