If $G$ is a finite group and $\chi$ is the character of an irreducible complex representation of $G$, then its **Frobenius-Schur indicator** is given by
\[ \frac{1}{|G|}\sum_{g\in G} \chi(g^2).\]
It is $0$, $1$, or $-1$ depending on whether the representation is of complex type, real type, or quaternionic type respectively.

**Authors:**

**Knowl status:**

- Review status: reviewed
- Last edited by Alina Bucur on 2019-05-02 20:58:32

**Referred to by:**

**History:**(expand/hide all)

- 2019-05-02 20:58:32 by Alina Bucur (Reviewed)
- 2019-05-02 20:55:22 by Alina Bucur
- 2013-09-12 01:33:18 by John Jones

**Differences**(show/hide)