Artin's theorem on induced characters
Jump to navigation
Jump to search
In representation theory, a branch of mathematics, Artin's theorem, introduced by E. Artin, states that a character on a finite group is a rational linear combination of characters induced from all cyclic subgroups of the group.
There is a similar but somehow more precise theorem due to Brauer, which says that the theorem remains true if "rational" and "cyclic subgroup" are replaced with "integer" and "elementary subgroup".
Statement
In Linear Representation of Finite Groups Serre states in Chapter 9.2, 17 [1] the theorem in the following, more general way:
Let finite group, family of subgroups.
Then the following are equivalent:
This in turn implies the general statement, by choosing as all cyclic subgroups of .
Proof
![]() | This section needs expansion. You can help by adding to it. (July 2024) |
References
- ^ Serre, Jean-Pierre (1977). Linear Representations of Finite Groups. New York, NY: Springer New York. ISBN 978-1-4684-9458-7. OCLC 853264255.