Dieudonné determinant
In linear algebra, the Dieudonné determinant is a generalization of the determinant of a matrix to matrices over division rings and local rings. It was introduced by Dieudonné (1943).
If K is a division ring, then the Dieudonné determinant is a homomorphism of groups from the group GLn(K) of invertible n by n matrices over K onto the abelianization K*/[K*, K*] of the multiplicative group K* of K.
For example, the Dieudonné determinant for a 2-by-2 matrix is
Properties
Let R be a local ring. There is a determinant map from the matrix ring GL(R) to the abelianised unit group R∗ab with the following properties:[1]
- The determinant is invariant under elementary row operations
- The determinant of the identity is 1
- If a row is left multiplied by a in R∗ then the determinant is left multiplied by a
- The determinant is multiplicative: det(AB) = det(A)det(B)
- If two rows are exchanged, the determinant is multiplied by −1
- If R is commutative, then the determinant is invariant under transposition
Tannaka–Artin problem
Assume that K is finite over its centre F. The reduced norm gives a homomorphism Nn from GLn(K) to F*. We also have a homomorphism from GLn(K) to F* obtained by composing the Dieudonné determinant from GLn(K) to K*/[K*, K*] with the reduced norm N1 from GL1(K) = K* to F* via the abelianization.
The Tannaka–Artin problem is whether these two maps have the same kernel SLn(K). This is true when F is locally compact[2] but false in general.[3]
See also
References
- ↑ Rosenberg (1994) p.64
- ↑ Nakayama, Tadasi; Matsushima, Yozô (1943). "Über die multiplikative Gruppe einer p-adischen Divisionsalgebra". Proc. Imp. Acad. Tokyo (in German). 19: 622–628. doi:10.3792/pia/1195573246. Zbl 0060.07901.
- ↑ Platonov, V.P. (1976). "The Tannaka-Artin problem and reduced K-theory". Izv. Akad. Nauk SSSR, Ser. Mat. (in Russian). 40: 227–261. Zbl 0338.16005.
- Dieudonné, Jean (1943), "Les déterminants sur un corps non commutatif", Bulletin de la Société Mathématique de France, 71: 27–45, ISSN 0037-9484, MR 0012273, Zbl 0028.33904
- Rosenberg, Jonathan (1994), Algebraic K-theory and its applications, Graduate Texts in Mathematics, 147, Berlin, New York: Springer-Verlag, ISBN 978-0-387-94248-3, MR 1282290, Zbl 0801.19001. Errata
- Serre, Jean-Pierre (2003), Trees, Springer, p. 74, ISBN 3-540-44237-5, Zbl 1013.20001
- Suprunenko, D.A. (2001), "Determinant", in Hazewinkel, Michiel, Encyclopedia of Mathematics, Springer, ISBN 978-1-55608-010-4