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Proof step 1 from proof lastoc (conclusion)

a ∈ x, a ∈ x0 ⊦ ∃ b, y, y0. b ∈ x ∧ x0 = y + b ' + y0 ∧ disj(x, y0)

System applied rule normalize

And obtained the following new goals

Proof step 2:
a ∈ x0, a ∈ x ⊦ ∃ b, y, y0. b ∈ x ∧ x0 = y + b ' + y0 ∧ disj(x, y0)

Rule argument

Additional information