lean_workbook_plus_44680

Proved

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

$\implies xy-x-y-1=0 \implies (x-1)(y-1)=2$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_44680  (x y : ℂ)
  (h₀ : x * y - x - y - 1 = 0) :
  (x - 1) * (y - 1) = 2   :=  by sorry

Source