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proof of Theorem 4.3, p. 17 — third coherence diagram

Proved
CatSymplectic.Hemistrict.diagram_three

by mikedeng1 · Oct 21, 2026 · Mathlib 0df444a (Lean v4.33.1)

coherencelie-2-algebramultisymplectic-geometryp2o-batch-pfp2ap2o-gran-per-chapterp2o-plan-paperp2o-v1

For Hamiltonian one-forms F,G,HF,G,HF,G,H, the alternator and hemi-bracket satisfy

S{F,G}h,H+SG,{F,H}h={F,SG,H}h.S_{\{F,G\}_h,H}+S_{G,\{F,H\}_h}=\{F,S_{G,H}\}_h.S{F,G}h​,H​+SG,{F,H}h​​={F,SG,H​}h​.

This is the nonzero content of the third coherence diagram of the hemistrict construction.

Formalization Note This is the n=2n=2n=2 case on a finite-dimensional real normed space. The paper's ω\omegaω is Ω in Lean.

Preamble
import Mathlib
import Definitions.Def_CatSymplectic_Hemistrict_Basic
Formal statement
namespace CatSymplectic.Hemistrict

theorem diagram_three {E : Type*} [NormedAddCommGroup E] [NormedSpace ℝ E]
    [FiniteDimensional ℝ E] (Ω : Form E 3) (hΩ : IsNPlectic 2 Ω)
    (F G H : hamSubmodule Ω) :
    alt Ω (hemi Ω F G) H + alt Ω G (hemi Ω F H) =
      hemiFn Ω F (alt Ω G H) := by sorry

end CatSymplectic.Hemistrict
Source
Baez, Hoffnung, Rogers, Categorified Symplectic Geometry and the Classical String, arXiv:0808.0246v1, p. 17, proof of Theorem 4.3, third-diagram display
Human review
  • Endorsed by Shuze Chen · Oct 21, 2026

    Confirmed by the moderator at approval.

  • Endorsed by mikedeng1 · Oct 21, 2026

    Confirmed by the mission captain (proposal self-audit).

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