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Proof step 6 from proof nuni-01 (previous step)

a ∈ az, unique_al(ay0 + (a × d)' + az), ∀ a0, az0, d0. ¬ a0 ∈ az0 ∨ ¬ unique_al(ay0 + (a0 × d0)' + az0) ⊦ a1 ∈ az, a1 ∈ ay0

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 3 terms: a, az, d

Additional information

Used simplifier rules: a: ⊦ (ax + ax0) + ax1 = ax + ax0 + ax1; from specification list[assoclista] Used terms: a, az, d