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Reducible Modules « The Unapologetic Mathematician
https://unapologetic.wordpress.com/2012/09/16/reducible-modules/
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algebra
lie algebras
representation theory
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As might be surmised from irreducible modules, a reducible module $latex M$ for a Lie algebra $latex L$ is one that contains a nontrivial proper submodule — one other than $latex 0$ or $latex…