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Jul 25, 2019 at 21:05 comment added Torsten Schoeneberg To your secondary question, if the subalgebra is not semisimple, its representation theory might be very mysterious and have nothing to do with weights, roots, ... to begin with!
Apr 19, 2018 at 19:23 review Close votes
Apr 20, 2018 at 10:18
Apr 19, 2018 at 18:56 history asked user117370 CC BY-SA 3.0