Skip to Main Content

Mathematics of Computation

Published by the American Mathematical Society since 1960 (published as Mathematical Tables and other Aids to Computation 1943-1959), Mathematics of Computation is devoted to research articles of the highest quality in computational mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2020 MCQ for Mathematics of Computation is 1.78.

What is MCQ? The Mathematical Citation Quotient (MCQ) measures journal impact by looking at citations over a five-year period. Subscribers to MathSciNet may click through for more detailed information.

 

Orderly generation of Butson Hadamard matrices
HTML articles powered by AMS MathViewer

by Pekka H. J. Lampio, Patric R. J. Östergård and Ferenc Szöllősi HTML | PDF
Math. Comp. 89 (2020), 313-331 Request permission

Abstract:

In this paper Butson-type complex Hadamard matrices $\mathrm {BH}(n,q)$ of order $n$ over the complex $q$th roots of unity are classified for small parameters by computer-aided methods. The results include a classification of $\mathrm {BH}(21,3)$, $\mathrm {BH}(16,4)$, and $\mathrm {BH}(14,6)$ matrices. There are exactly $72$, $1786763$, and $167776$ such matrices, respectively, up to monomial equivalence. Additionally, an example of a $\mathrm {BH}(14,10)$ matrix is shown for the first time, and the nonexistence of $\mathrm {BH}(8,15)$, $\mathrm {BH}(11,q)$ for $q\in \{10,14,15\}$, and $\mathrm {BH}(13,15)$ matrices is proved.
References
Similar Articles
  • Retrieve articles in Mathematics of Computation with MSC (2010): 05B20
  • Retrieve articles in all journals with MSC (2010): 05B20
Additional Information
  • Pekka H. J. Lampio
  • Affiliation: Department of Communications and Networking, Aalto University School of Electrical Engineering, P.O. Box 15400, 00076 Aalto, Finland
  • MR Author ID: 919188
  • Email: pekka.lampio@aalto.fi
  • Patric R. J. Östergård
  • Affiliation: Department of Communications and Networking, Aalto University School of Electrical Engineering, P.O. Box 15400, 00076 Aalto, Finland
  • Email: patric.ostergard@aalto.fi
  • Ferenc Szöllősi
  • Affiliation: Department of Communications and Networking, Aalto University School of Electrical Engineering, P.O. Box 15400, 00076 Aalto, Finland
  • Email: szoferi@gmail.com
  • Received by editor(s): September 21, 2017
  • Received by editor(s) in revised form: March 27, 2019
  • Published electronically: June 4, 2019
  • Additional Notes: This research was supported in part by the Academy of Finland, Grant #289002
  • © Copyright 2019 American Mathematical Society
  • Journal: Math. Comp. 89 (2020), 313-331
  • MSC (2010): Primary 05B20
  • DOI: https://doi.org/10.1090/mcom/3453
  • MathSciNet review: 4011544