lean_workbook_plus_4350

Proved

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

Let $v>u>1$ such that $f(v)=1$ and $f(f(u))=-1$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_4350 (f : ℝ → ℝ) (u v : ℝ) (h₁ : v > u) (h₂ : u > 1) (h₃ : f v = 1) (h₄ : f (f u) = -1) : ∃ u v, v > u ∧ u > 1 ∧ f v = 1 ∧ f (f u) = -1   :=  by sorry

Source

https://huggingface.co/datasets/internlm/Lean-Workbook

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