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Proof step 8 from proof firstoc (previous step)

∀ a. a ∈ ax0 → (∃ ax2, d, ax1. ax0 = ax2 + (a × d)' + ax1 ∧ ¬ a ∈ ax2) ⊦ ∃ ax, d0, ax1. (a0 × d)' + ax0 = ax + (a0 × d0)' + ax1 ∧ ¬ a0 ∈ ax

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

pos: right 1 terms: [], d, ax0

Additional information

Used simplifier rules: empty: ⊦ ¬ a ∈ [];%Nil: ⊦ [] + ax = ax; from specification list[assoclista]%a: ⊦ (ax + ax0) + ax1 = ax + ax0 + ax1; from specification list[assoclista]%app-08: ⊦ p ' + ax = p ' + ax0 ↔ ax = ax0; from specification list[assoclista] Used terms: [], d, ax0