lean_workbook_plus_32605

Proved

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

For every $x\in \mathbb{R}$ , prove that $x^{6}-x^{5}+x^{4}-x^{3}+x^{2}-x+\frac{2}{5}>0.$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_32605 (x : ℝ) : x^6 - x^5 + x^4 - x^3 + x^2 - x + 2/5 > 0   :=  by sorry

Source