Fusion and Supercharacters

Kenneth W. Johnson

Research output: Chapter in Book/Report/Conference proceedingChapter


In this chapter the idea of fusion of the character table of a group is pursued in more detail. First the question of which groups have the property that their character table is a fusion of that of an abelian group is addressed. It proved difficult to answer this question but many results can be obtained. There is given an explicit description of the finite groups whose character tables fuse from a cyclic group. Then there is given an account of how the idea of fusion was independently discovered and used in the context of upper triangular groups UTn(q) by Diaconis and Isaacs. Their motive was that whereas the character tables of UTn(q) are “wild” certain fusions are not and random walks on the groups can be discussed. The interesting result that a fusion of the character table gives rise to a Hopf algebra is presented. There is also given a construction of a fusion of the character table of UT4(q) by taking the class algebra of a loop constructed by an alternative multiplication on the elements on the elements of the group.

Original languageEnglish (US)
Title of host publicationLecture Notes in Mathematics
PublisherSpringer Verlag
Number of pages25
StatePublished - Jan 1 2019

Publication series

NameLecture Notes in Mathematics
ISSN (Print)0075-8434
ISSN (Electronic)1617-9692

All Science Journal Classification (ASJC) codes

  • Algebra and Number Theory


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