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Proof step 1 from proof isprefix-size (conclusion)

⊦ lax0 ⊑ lax2 + lax ∧ # lax = # gndx → ¬ # lax2 + # gndx < # lax0

System applied rule normalize

And obtained the following new goals

Proof step 2:
# lax = # gndx, # lax2 + # gndx < # lax0, lax0 ⊑ lax2 + lax ⊦

Rule argument

Additional information