How large is the character degree sum compared to the character table sum for a finite group?

Seminar
Speaker
Arvind Ayyer (IISC, Bangalore)
Date
16/06/2024 - 14:30 - 13:15Add to Calendar 2024-06-16 13:15:00 2024-06-16 14:30:00 How large is the character degree sum compared to the character table sum for a finite group? Link to the recording In 1961, Solomon proved that the sum of all the entries in the character table of a finite group does not exceed the cardinality of the group. We state a different and incomparable property here -- this sum is at most twice the sum of degrees of the irreducible characters. Although this is not true in general, it seems to hold for "most" groups. We establish the validity of this property for symmetric, hyperoctahedral and demihyperoctahedral groups. Using these techniques, we are able to show that the asymptotics of the character table sums is the same as the number of involutions in these groups. We will also derive generating functions for the character tables sum for these groups as infinite products of continued fractions. This is joint work with D. Paul and H. K. Dey (Arxiv:2406.06036). ZOOM אוניברסיטת בר-אילן - Department of Mathematics mathoffice@math.biu.ac.il Asia/Jerusalem public
Place
ZOOM
Abstract

Link to the recording

In 1961, Solomon proved that the sum of all the entries in the character
table of a finite group does not exceed the cardinality of the group.
We state a different and incomparable property here -- this sum is at
most twice the sum of degrees of the irreducible characters. Although
this is not true in general, it seems to hold for "most" groups. We
establish the validity of this property for symmetric, hyperoctahedral
and demihyperoctahedral groups. Using these techniques, we are able to
show that the asymptotics of the character table sums is the same as the
number of involutions in these groups. We will also derive generating
functions for the character tables sum for these groups as infinite
products of continued fractions.
This is joint work with D. Paul and H. K. Dey (Arxiv:2406.06036).

Last Updated Date : 17/06/2024