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Proof step 1 from proof append-notsmallersize2 (conclusion)

⊦ σ + σ0 = σ1 → (# σ1 < # σ0 ↔ false)

System applied rule normalize

And obtained the following new goals

Proof step 2:
σ + σ0 = σ1 ⊦ # σ1 < # σ0 ↔ false

Rule argument

Additional information