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Proof step 6 from proof le-same (previous step)

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

User applied rule insert equation

And obtained the following new goals

Proof step 7:
(m + m * n -1) + n0 ≤ m, n0 ≤ m ⊦ m = 0, n = 0, n = 1 ∧ n0 = 0

Rule argument

pos: left 1 flags: discard

Additional information