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Proof step 1 from proof inv-remove-refsize0-diff (conclusion)

⊦ inv(st \ ns) ∧ dom remove-refsize0(st) ∩ ns = ∅ → inv(remove-refsize0(st))

System applied rule normalize

And obtained the following new goals

Proof step 2:
dom remove-refsize0(st) ∩ ns = ∅, inv(st \ ns) ⊦ inv(remove-refsize0(st))

Rule argument

Additional information