Degrees, class sizes and divisors of character values
@article{Gallagher2012DegreesCS, title={Degrees, class sizes and divisors of character values}, author={Patrick X. Gallagher}, journal={Journal of Group Theory}, year={2012}, volume={15}, pages={455 - 467} }
Abstract. In the character table of a finite group there is a tendency either for the character degree to divide the conjugacy class size or the character value to vanish. There is also a partial divisibility where the determinant of the character is not 1. There are versions of these depending on a subgroup, based on an arithmetic property of spherical functions which generalizes the integrality of the values of the characters and the central characters.
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References
SHOWING 1-10 OF 24 REFERENCES
Character Theory of Finite Groups
- Mathematics
- 2010
1. (i) Suppose K is a conjugacy class of Sn contained in An; then K is called split if K is a union of two conjugacy classes of An. Show that the number of split conjugacy classes contained in An is…
On the number of conjugacy classes of zeros of characters
- Mathematics
- 2004
Letm be a fixed non-negative integer. In this work we try to answer the following question: What can be said about a (finite) groupG if all of its irreducible (complex) characters vanish on at mostm…
Orders of elements and zeros and heights of characters in a finite group
- Mathematics
- 2006
Let \chi be an irreducible character of the finite group G. If g is an element of G and \chi(g) is not zero, then we conjecture that the order of g divides |G|/\chi(1). The conjecture is a…
Finite Group Elements where No Irreducible Character Vanishes
- Mathematics
- 1999
In this paper, we consider elements x of a finite group G with the property that χ(x) ≠ 0 for all irreducible characters χ of G. If G is solvable and x has odd order, we show that x must lie in the…
Irreducible Symmetric Group Characters of Rectangular Shape
- Mathematics
- 2001
We give a new formula for the values of an irreducible character of the symmetric group S_n indexed by a partition of rectangular shape. Some observations and a conjecture are given concerning a…
Induction and Restriction of π-Special Characters
- MathematicsCanadian Journal of Mathematics
- 1986
1. Introduction. The character theory of solvable groups has undergone significant development during the last decade or so and it can now be seen to have quite a rich structure. In particular, there…
The Stanley-Féray-Śniady formula for the generalized characters of the symmetric group
- Mathematics
- 2011
We show that the explicit formula of Stanley-F\'eray-\'Sniady for the characters of the symmetric group have a natural extension to the generalized characters. These are the spherical functions of…
Elementary proof of Brauer’s and Nesbitt’s theorem on zeros of characters of finite groups
- Mathematics
- 2000
The following has been proven by Brauer and Nesbitt. Let G be a finite group, and let p be a prime. Assume x is an irreducible complex character of G such that the order of a p-Sylow subgroup of G…