Illinois Journal of Mathematics

Every central simple algebra is Brauer equivalent to a Hopf Schur algebra

Ehud Meir

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Abstract

We show that every central simple algebra $A$ over a field $k$ is Brauer equivalent to a quotient of a finite dimensional Hopf algebra over the same field. This shows that the natural generalization of the Schur group for Hopf algebras (which we call the Hopf Schur group) is in fact the entire Brauer group of $k$. If the characteristic of the field is zero, or if the algebra has a Galois splitting field with certain properties, we can take this Hopf algebra to be semisimple. We also show that if $F$ is any finite separable extension of $k$, then $F$ is a quotient of a finite dimensional commutative semisimple and cosemisimple Hopf algebra over $k$.

Article information

Source
Illinois J. Math., Volume 56, Number 2 (2012), 423-432.

Dates
First available in Project Euclid: 22 November 2013

Permanent link to this document
https://projecteuclid.org/euclid.ijm/1385129957

Digital Object Identifier
doi:10.1215/ijm/1385129957

Mathematical Reviews number (MathSciNet)
MR3161333

Zentralblatt MATH identifier
1288.16023

Subjects
Primary: 16K50: Brauer groups [See also 12G05, 14F22] 16T20: Ring-theoretic aspects of quantum groups [See also 17B37, 20G42, 81R50]

Citation

Meir, Ehud. Every central simple algebra is Brauer equivalent to a Hopf Schur algebra. Illinois J. Math. 56 (2012), no. 2, 423--432. doi:10.1215/ijm/1385129957. https://projecteuclid.org/euclid.ijm/1385129957


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