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On finite GK-dimensional Nichols algebras over abelian groups

About this Title

Nicolás Andruskiewitsch, Iván Angiono and István Heckenberger

Publication: Memoirs of the American Mathematical Society
Publication Year: 2021; Volume 271, Number 1329
ISBNs: 978-1-4704-4830-1 (print); 978-1-4704-6636-7 (online)
DOI: https://doi.org/10.1090/memo/1329
Published electronically: August 11, 2021

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Table of Contents

Chapters

  • 1. Introduction
  • 2. Preliminaries
  • 3. Yetter-Drinfeld modules of dimension 2
  • 4. Yetter-Drinfeld modules of dimension 3
  • 5. One block and several points
  • 6. Two blocks
  • 7. Several blocks, several points
  • 8. Appendix

Abstract

We contribute to the classification of Hopf algebras with finite Gelfand-Kirillov dimension, $\operatorname {GKdim}$ for short, through the study of Nichols algebras over abelian groups. We deal first with braided vector spaces over $\mathbb {Z}$ with the generator acting as a single Jordan block and show that the corresponding Nichols algebra has finite $\operatorname {GKdim}$ if and only if the size of the block is 2 and the eigenvalue is $\pm 1$; when this is 1, we recover the quantum Jordan plane. We consider next a class of braided vector spaces that are direct sums of blocks and points that contains those of diagonal type. We conjecture that a Nichols algebra of diagonal type has finite $\operatorname {GKdim}$ if and only if the corresponding generalized root system is finite. Assuming the validity of this conjecture, we classify all braided vector spaces in the mentioned class whose Nichols algebra has finite $\operatorname {GKdim}$. Consequently we present several new examples of Nichols algebras with finite $\operatorname {GKdim}$, including two not in the class alluded to above. We determine which among these Nichols algebras are domains.

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