Original scientific paper

Ryser's Conjecture under eigenvalue conditions

Luis H. Gallardo ; Department of Mathematics, University of Brest, 6 Avenue Victor Le Gorgeu, France

Abstract

We prove the nonexistence of a circulant Hadamard matrix H of order n, under technical conditions on the eigenvalues of H, when n has only two odd prime divisors and in the general case

Keywords

Hadamard matrices; circulant matrices; eigenvalues; cyclotomic polynomials; congruences

Hrčak ID:

227095

URI

https://hrcak.srce.hr/227095

Publication date:

25.10.2019.

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