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Creators/Authors contains: "Lusztig, George"

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  1. ; (, Representation theory)
    Let $$G$$ be a semisimple simply connected complex algebraic group. Let $$U$$ be the unipotent radical of a Borel subgroup in $$G$$. We describe the coordinate rings of $$U$$ (resp., $G/U$, $$G$$) in terms of two (resp., four, eight) birational charts introduced by Lusztig [Total positivity in reductive groups, Birkhäuser Boston, Boston, MA, 1994; Bull. Inst. Math. Sin. (N.S.) 14 (2019), pp. 403–459] in connection with the study of total positivity. 
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