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Proof step 3 from proof validref-union-left (conclusion)

⊦ validref(str, r, ty, st0) ∧ st0 .refs ∩ st .refs = ∅ → validref(str, r, ty, st0 ∪ st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
st0 .refs ∩ st .refs = ∅, validref(str, r, ty, st0) ⊦ validref(str, r, ty, st0 ∪ st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]