∀[n:ℕ]. ∀[q:ℚ]. (Σ0 ≤ i < n. q = (n * q) ∈ ℚ)
{ InductionOnNat }
.....basecase.....
1. n : ℤ
⊢ ∀[q:ℚ]. (Σ0 ≤ i < 0. q = (0 * q) ∈ ℚ)
.....upcase.....
1. n : ℤ
2. 0 < n
3. ∀[q:ℚ]. (Σ0 ≤ i < n - 1. q = ((n - 1) * q) ∈ ℚ)
⊢ ∀[q:ℚ]. (Σ0 ≤ i < n. q = (n * q) ∈ ℚ)