Characterization of cyclic Schur groups
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- by S. Evdokimov, I. Kovács and I. Ponomarenko
- St. Petersburg Math. J. 25 (2014), 755-773
- DOI: https://doi.org/10.1090/S1061-0022-2014-01315-5
- Published electronically: July 18, 2014
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Abstract:
A finite group $G$ is called a Schur group if any Schur ring over $G$ is associated in a natural way with a subgroup of $\mathrm {Sym}(G)$ that contains all right translations. It was proved by R. Pöschel (1974) that, given a prime $p\ge 5$, a $p$-group is Schur if and only if it is cyclic. We prove that a cyclic group of order $n$ is Schur if and only if $n$ belongs to one of the following five families of integers: $p^k$, $pq^k$, $2pq^k$, $pqr$, $2pqr$ where $p$, $q$, $r$ are distinct primes, and $k\ge 0$ is an integer.References
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Bibliographic Information
- S. Evdokimov
- Affiliation: St. Petersburg Branch, Steklov Mathematical Institute, Russian Academy of Sciences Fontanka 27, St. Petersburg 191023, Russia
- Email: evdokim@pdmi.ras.ru
- I. Kovács
- Affiliation: IAM and FAMNIT, University of Primorska, Muzejski trg 2, SI6000, Koper, Slovenia
- Email: istvan.kovacs@upr.si
- I. Ponomarenko
- Affiliation: St. Petersburg Branch, Steklov Mathematical Institute, Russian Academy of Sciences, Fontanka 27, St. Petersburg 191023, Russia
- Email: inp@pdmi.ras.ru
- Received by editor(s): September 7, 2012
- Published electronically: July 18, 2014
- Additional Notes: This work was partially supported by the Slovenian–Russian bilateral project, grants nos. BI-RU/10-11-018 and BI-RU/12-13-035. The third author was also supported by the RFFI grant no. 11-01-00760-a
- © Copyright 2014 American Mathematical Society
- Journal: St. Petersburg Math. J. 25 (2014), 755-773
- MSC (2010): Primary 05E30, 20B25
- DOI: https://doi.org/10.1090/S1061-0022-2014-01315-5
- MathSciNet review: 3184607