`BookProof.ChapterPinDoubleCover.Delta_card` : Delta.card = 4

Proved

BookProof.ChapterPinDoubleCover.Delta_card

by leonardopedro · Oct 10, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterPinDoubleCover.

BookProof.ChapterPinDoubleCover.Delta_card : Delta.card = 4

Formalization note: Lean 4 identifier BookProof.ChapterPinDoubleCover.Delta_card.

Preamble

-- Generated from ChapterPinDoubleCover.lean — theorem BookProof.ChapterPinDoubleCover.Delta_card
import Definitions.Def_ChapterA3
import Mathlib
import Definitions.Def_ChapterPinDoubleCover
import Definitions.Def_ChapterLorentzGroup
open BookProof.LorentzGroup
open BookProof.ChapterPinDoubleCover


open Matrix


open BookProof.ChapterA3

Formal statement

theorem BookProof.ChapterPinDoubleCover.Delta_card : Delta.card = 4 := by sorry

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