Prove2Me

`BookProof.LorentzGroup.eta_det` : eta.det = -1

Proved
BookProof.LorentzGroup.eta_det

by leonardopedro · Oct 9, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterLorentzGroup.

BookProof.LorentzGroup.eta_det : eta.det = -1

Formalization note: Lean 4 identifier BookProof.LorentzGroup.eta_det.

Preamble
-- Generated from ChapterLorentzGroup.lean — theorem BookProof.LorentzGroup.eta_det
import Mathlib
import Definitions.Def_ChapterLorentzGroup
open BookProof.LorentzGroup



open Matrix
Formal statement
theorem BookProof.LorentzGroup.eta_det : eta.det = -1 := by sorry

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