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Proof step 4 from proof unique-01 (previous step)

unique_al(p + ax0), unique_al((p + ax0) + (a × d)'), a ∈ p + ax0, ∀ a, d. ¬(unique_al(ax0 + (a × d)') ∧ unique_al(ax0) ∧ a ∈ ax0) ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
unique_al((p ' + ax0) + (a × d)'), unique_al(p ' + ax0), ∀ a0, d0. ¬ unique_al(ax0 + (a0 × d0)') ∨ ¬ unique_al(ax0) ∨ ¬ a0 ∈ ax0, a ∈ p ' ∨ a ∈ ax0 ⊦

Rule argument

Additional information

Used simplifier rules: inapp: ⊦ a ∈ ax + ay ↔ a ∈ ax ∨ a ∈ ay;%unique: ⊦ unique_al(ax + p ') → unique_al(ax);%a: ⊦ (ax + ax0) + ax1 = ax + ax0 + ax1; from specification list[assoclist]% ⊦ p + ax = p ' + ax; (s)