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Proof step 1 from proof neq-07 (conclusion)

⊦ a ≠ a0 ∧ a1 ≠ a0 ∧ a ≠ a1 ∧ ¬ a ∈ y1 ∧ ¬ a1 ∈ y0 → y1 + a0 ' + y0 + a ' ≠ y2 + a ' + a1 ' + z0

System applied rule normalize

And obtained the following new goals

Proof step 2:
y1 + a0 ' + y0 + a ' = y2 + a ' + a1 ' + z0 ⊦ a = a1, a = a0, a1 = a0, a1 ∈ y0, a ∈ y1

Rule argument

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