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Proof step 18 from proof ordered-ex-divide-lels (previous step)

b ∈ z, ordered≤(a0 ' + y + z), a < a0, b < a0, ∀ b. b ∈ z → a < b, ∀ b. b ∈ y → b < a ∨ b = a ⊦ a0 = a, a < b

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 5 terms: b

Additional information

Used terms: b