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PERMANENTS OF HESSENBERG

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-MATRICES REVISITED

BRENT J. DESCHAMP† AND BRYAN L. SHADER

Abstract. This paper considers the maximum value of the permanent over the classH(m, n) of n×nHessenberg, (0,1)-matrices withm1’s, and shows that among those matrices that attain the maximum value there exists a matrix with a special form. This special form determines the exact value of the maximum permanent onH(m, n) for certain values ofmandn.

Key words. Hessenberg matrices, Permanents.

AMS subject classifications.15A15.

Received by the editors January 7, 2008. Accepted for publication on January 13, 2010. Handling

Editor: Shmuel Friedland.

Department of Mathematics & Statistics, California State Polytechnic University, Pomona,

Pomona, California 91768, USA (bjdeschamp@csupomona.edu).

Department of Mathematics, University of Wyoming, Laramie, Wyoming 82071, USA

(bshader@uwyo.edu).

Electronic Journal of Linear Algebra ISSN 1081-3810 A publication of the International Linear Algebra Society Volume 20, pp. 20-52, January 2010

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