proof app:A-long-proofs@proof-249

open in the book · appendices/A-long-proofs.tex:20110

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proof : app:A-long-proofs@proof-249proofcorollary A.411: Semisimple algebras admit no nontrivial extensionA.411corollary A.344: The algebras so(p,q) are semisimpleA.344proposition 14.76: H^2 classifies the central extensions14.76theorem A.410: Whitehead's first and second lemmasA.410

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proves Semisimple algebras admit no nontrivial extension declared appendices/A-long-proofs.tex:20110