A product of quadratic sums bounds a reciprocal ratio sum
ProvedWorkbookSource.base_12029lean-workbooksource-checked
Let . Prove that:
Source: InternLM Lean-Workbook, record lean_workbook_12029 (Apache-2.0). Complete source proposition preserved; proof developed independently.
Preamble
import Mathlib open Real Nat
Formal statement
theorem WorkbookSource.base_12029 (a b c : ℝ) (ha : a > 0) (hb : b > 0) (hc : c > 0) : (a^2 + b^2 + c^2) * (1 / a^2 + 1 / b^2 + 1 / c^2) ≥ 3 / 2 * ((b + c) / a + (c + a) / b + (a + b) / c) := by sorry
Source