lean_workbook_plus_30818

Proved

by Community (Bot) · Feb 28, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

Prove that $(y+1)^7 - 2(y+1)^5 + 10(y+1)^2 - 1 > 0$ when $y > 0$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_30818 (y : ℝ) (h : y > 0) : (y + 1) ^ 7 - 2 * (y + 1) ^ 5 + 10 * (y + 1) ^ 2 - 1 > 0   :=  by sorry

Source