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Proof step 1 from proof sizesubl (conclusion)

⊦ s ⊆ s0 ∧ a ∈ s0 ∧ ¬ a ∈ s → # s < # s0

System applied rule normalize

And obtained the following new goals

Proof step 2:
a ∈ s0, s ⊆ s0 ⊦ # s < # s0, a ∈ s

Rule argument

Additional information