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Homomorphisms between standard modules over finite-type KLR algebras

Published online by Cambridge University Press:  01 March 2017

Alexander S. Kleshchev
Affiliation:
Department of Mathematics, University of Oregon, Eugene, OR 97403, USA email klesh@uoregon.edu
David J. Steinberg
Affiliation:
Department of Mathematics, University of Oregon, Eugene, OR 97403, USA email dsteinbe@uoregon.edu
Corresponding

Abstract

Khovanov–Lauda–Rouquier (KLR) algebras of finite Lie type come with families of standard modules, which under the Khovanov–Lauda–Rouquier categorification correspond to PBW bases of the positive part of the corresponding quantized enveloping algebra. We show that there are no non-zero homomorphisms between distinct standard modules and that all non-zero endomorphisms of a standard module are injective. We present applications to the extensions between standard modules and modular representation theory of KLR algebras.

Type
Research Article
Copyright
© The Authors 2017 

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