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Proof step 1 from proof union-size-not-less-02 (conclusion)

⊦ # s0 ≤ m ∧ # s1 ≤ n → ¬ m + n + 1 < #(s0 ∪ s1)

System applied rule normalize

And obtained the following new goals

Proof step 2:
m + n + 1 < #(s0 ∪ s1), # s0 ≤ m, # s1 ≤ n ⊦

Rule argument

Additional information