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Proof step 4 from proof le-same (previous step)

m * n + n0 ≤ m, n0 ≤ m ⊦ n = 0, n = 1 ∧ n0 = 0, m = 0 ∧ n0 = 0

User applied rule case distinction

And obtained the following new goals

Proof step 5:
m * n + n0 ≤ m, n0 ≤ m ⊦ m = 0, n = 0, n = 1 ∧ n0 = 0
Proof step 9:
m * n + n0 ≤ m, n0 ≤ m ⊦ n0 = 0, n = 0, n = 1 ∧ n0 = 0

Rule argument

pos: right 3

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