Prove2Me

Lean-Workbook Plus 34790: Trigonometric identity

Proved
WorkbookRestored.plus_34790

by wamlart · Sep 12, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

lean-workbookrestored-importssource-checked

Lean-Workbook Plus 34790: Integer matrix with nonzero determinant

There exists a 2×22\times2 matrix with integer entries and nonzero determinant.

Source: Lean-Workbook row lean_workbook_plus_34790 (Apache-2.0). The unchanged proposition comes from the original record; its missing mathematical imports and namespaces are restored here.

Preamble
import Mathlib.LinearAlgebra.Matrix.Determinant.Basic
Formal statement
theorem WorkbookRestored.plus_34790 : ∃ A : Matrix (Fin 2) (Fin 2) ℤ, A.det ≠ 0   :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, row lean_workbook_plus_34790; immutable original Prove2Me node 590b737f-5ed2-49c1-8fbc-98b6d2b6f0fd

View graph