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Nov 17, 2020 at 0:31 comment added LSpice Name of @GA316's link: Damianou - On the characteristic polynomial of Cartan matrices and Chebyshev polynomials. \\ Also, as a matter of terminology, you are taking eigenvalues and eigenvectors of a Cartan matrix, not of a root system or of a Lie group (whatever that would mean).
Nov 16, 2020 at 23:18 comment added GA316 This may be related: arxiv.org/pdf/1110.6620.pdf
Nov 16, 2020 at 23:07 history asked annie marie cœur CC BY-SA 4.0