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Proof step 5 from proof square-interval (previous step)

m < n + 1, n * (n + 1) + 2 * n0 < (n + 1) * (n + 2), m * (m + 1) ≤ n * (n + 1) + 2 * n0, n * (n + 1) + 2 * n0 < (m + 1) * (m + 2), n0 ≤ n ⊦ m = n

User applied rule cut formula

And obtained the following new goals

Proof step 6:
n * (n + 1) < (m + 1) * ((m + 1) + 1), m < n + 1, n * (n + 1) + 2 * n0 < (n + 1) * (n + 2), m * (m + 1) ≤ n * (n + 1) + 2 * n0, n * (n + 1) + 2 * n0 < (m + 1) * (m + 2), n0 ≤ n ⊦ m = n

Rule argument

fma: n * (n + 1) < (m + 1) * ((m + 1) + 1)

Additional information

Used simplifier rules: rsucc-01: ⊦ (m + 1) * n = m * n + n;%mult-a: ⊦ m0 * m * n = (m0 * m) * n;%mult-c: ⊦ m * n = n * m;%dist: ⊦ m0 * (m + n) = m0 * m + m0 * n;%succ: ⊦ (* m0) * m + m = (m0 + 1) * m;%numeral-24: m1 ≠ 0 ⊦ m + n < (* m1) * m + n0 ↔ n < (m1 - 1) * m + n0;%coef-21: ⊦ m * n < m1 * n + n ↔ ¬ ¬(m < m1 + 1 ∧ n ≠ 0);%neq-01: ⊦ m ≠ n → (m < n + 1 ↔ m < n); from specification nat-basic2%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic2%c: ⊦ m + n = n + m; from specification nat-basic2%l: ⊦ m + n < m + n0 ↔ n < n0; from specification nat-basic2%s: ⊦ m < n + 1 ↔ ¬ n < m; from specification nat-basic2%le-ls-simp: ⊦ m ≤ n → (n < m ↔ false); from specification nat%lels: ⊦ ¬ m < n ↔ n ≤ m; from specification nat%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic1%fle: ⊦ m < n ∧ n ≤ n0 → m < n0; (forward) from specification nat%fle-01: ⊦ m ≤ n ∧ n < n0 → m < n0; (forward) from specification nat%add-num-03: n < n0 ⊦ (* n) ≠ m0 + (* n0); from specification nat%l-02: ⊦ ¬ m + n < m; from specification nat-basic2 Used formulas: n * (n + 1) < (m + 1) * ((m + 1) + 1)