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Proof step 11 from proof union-subset-left (previous step)

st .refs ∩ st0 .refs = ∅, r -- sk ∈ st ⊦ st[r -- sk] = (st ∪ st0)[r -- sk]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPFORWARD : ⊦ r -- sk ∈ st → r ∈ st])]]