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Proof step 1 from proof remove-refsize0-refsize-cons (conclusion)

⊦ as ⊆ dom nodes(st) ∧ refsize-cons(st, as) ∧ inv(st) → as ⊆ dom nodes(remove-refsize0(st))

System applied rule normalize

And obtained the following new goals

Proof step 2:
inv(st), refsize-cons(st, as), as ⊆ dom nodes(st) ⊦ as ⊆ dom nodes(remove-refsize0(st))

Rule argument

Additional information