Critical groups for Hopf algebra modules

D. A.R.I.J. Grinberg, J. I.A. Huang, Victor Reiner

Research output: Contribution to journalArticle


This paper considers an invariant of modules over a finite-dimensional Hopf algebra, called the critical group. This generalises the critical groups of complex finite group representations studied in [1, 11]. A formula is given for the cardinality of the critical group generally, and the critical group for the regular representation is described completely. A key role in the formulas is played by the greatest common divisor of the dimensions of the indecomposable projective representations.

Original languageEnglish (US)
JournalMathematical Proceedings of the Cambridge Philosophical Society
StateAccepted/In press - 2018

ASJC Scopus subject areas

  • Mathematics(all)

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