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Proof step 1 from proof del1-01-01 (conclusion)

⊦ ordered≤(a ' + (x -1l a)) ∧ ordered≤(x) ∧ a ∈ x → a ' + (x -1l a) = x

System applied rule normalize

And obtained the following new goals

Proof step 2:
ordered≤(a ' + (x -1l a)), ordered≤(x), a ∈ x ⊦ a ' + (x -1l a) = x

Rule argument

Additional information