lean_workbook_plus_14185
OpenProve that combinatorially.
Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_14185 (n : ℕ) : choose (2 * n) 2 = 2 * choose n 2 + n^2 := by sorry
Source
Prove that combinatorially.
import Mathlib.Analysis.Complex.Basic
theorem lean_workbook_plus_14185 (n : ℕ) : choose (2 * n) 2 = 2 * choose n 2 + n^2 := by sorry