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Proof step 13 from proof three (previous step)

m1 * m + m ≤ 3, ∀ m0. m0 * m1 ≤ 3 → m1 = 2 ∨ m0 = 2 ∨ m0 = 0 ∨ m0 = 1 ⊦ m = 0, m = 1, 1 = m1, m = 2, m1 = 0

User applied rule weakening

And obtained the following new goals

Proof step 14:
m1 * m + m ≤ 3 ⊦ m = 0, m = 1, 1 = m1, m = 2, m1 = 0

Rule argument

poslist: left 2

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