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Used unicode subscripts for indices of exceptional Lie groups including title and links. When not linked, usual formulas are used. See discussion here. Links will be re-checked after all titles have been changed. (Added redirect for “E9” at the bottom of the page.)
added a brief note (here) on representations of the maximal compact sub-algebra $\mathfrak{k}_{9(9)}$ of $\mathfrak{e}_{9(9)}$
together with more references, notably to the recent
(I had had numerological reason to suspect the “first” $\mathfrak{k}_{9(9)}$-irrep summand in the basic $\mathfrak{e}_{9(9)}$-rep to have dimension 256 — and I found König’s article by asking Google for what is has on 256-dim reps related to $E_9$.)
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