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JOURNALS // Zapiski Nauchnykh Seminarov POMI // Archive

Zap. Nauchn. Sem. POMI, 2021 Volume 500, Pages 11–29 (Mi znsl7063)

This article is cited in 1 paper

Enhanced Dynkin diagrams done right

N. A. Vavilov, V. Migrin

Dept. of Mathematics and Computer Science, St Petersburg State University, St Petersburg, Russia

Abstract: In the present paper we slightly modify the Dynkin–Minchenko construction of enhanced Dynkin diagrams and construct signed enhanced Dynkin diagrams of exceptional types $\Phi=\mathrm{E}_6$, $\mathrm{E}_7$, $\mathrm{E}_8$. We observe that these diagrams contain as subdiagrams all Carter–Stekolshchik diagrams of conjugacy classes of the Weyl groups $W(\Phi)$.

Key words and phrases: Exceptional root systems, root subsystems, conjugacy classes of the Weyl group, Dynkin diagrams, Carter diagrams.

UDC: 512.5

Received: 27.05.2021

Language: English



© Steklov Math. Inst. of RAS, 2025