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Proof step 3 from proof mult-le-01 (previous step)

m ≤ n ⊦ n * n ≤ m + 1 ↔ n ≤ 1 ∧ m ≤ 1

User applied rule cut formula

And obtained the following new goals

Proof step 4:
m ≤ n, m * n ≤ m + 1 ⊦ n * n ≤ m + 1 ↔ n ≤ 1 ∧ m ≤ 1
Proof step 8:
m ≤ n ⊦ n * n ≤ m + 1 ↔ n ≤ 1 ∧ m ≤ 1, m * n ≤ m + 1

Rule argument

fma: m * n ≤ m + 1

Additional information

Used formulas: m * n ≤ m + 1