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Proof step 1 from proof inapp-09 (conclusion)

⊦ x + y = z + a ' ∧ c ' + x = x0 + b ' ∧ x0 ≠ [] ∧ a ≠ b → b ∈ z

System applied rule normalize

And obtained the following new goals

Proof step 2:
x + y = z + a ', c ' + x = x0 + b ' ⊦ a = b, x0 = [], b ∈ z

Rule argument

Additional information