lemma A.398 The differential squares to zero in the degrees used

open in the book · appendices/A-long-proofs.tex:19448 · p. 2986

Rests on

depends_on definition A.397 Cochains and the differential ¶
- depends_on definition 14.75 The classifying group ¶
  - depends_on definition 14.74 Coboundary and triviality ¶
    - depends_on proposition 14.73 The extension datum is a $2$-cocycle ¶
      - depends_on definition 14.72 Central extension ¶
      - proves proof ch:12-lie-groups-fibre-bundles@proof-35 ¶
  - depends_on proposition 14.73 The extension datum is a $2$-cocycle ¶ ↺
proves proof app:A-long-proofs@proof-239 ¶

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type	direction	node	provenance	where
`depends_on`	→	Cochains and the differential	declared	appendices/A-long-proofs.tex:19454
`proves`	←	app:A-long-proofs@proof-239	declared	appendices/A-long-proofs.tex:19457