Conserved quantities of the integrable discrete hungry systems

Sonomi  Kakizaki; Akiko  Fukuda; Yusaku  Yamamoto; Masashi  Iwasaki; Emiko  Ishiwata; Yoshimasa  Nakamura

doi:10.3934/dcdss.2015.8.889

Article Contents

2015, Volume 8, Issue 5: 889-899. Doi: 10.3934/dcdss.2015.8.889

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Conserved quantities of the integrable discrete hungry systems

1.
Department of Mathematical Science for Information Sciences, Graduate School of Science, Tokyo University of Science, Tokyo 162-8601
2.
Department of Mathematical Sciences, Shibaura Institute of Technology, Saitama 337-8570
3.
Department of Communication Engineering and Informatics, The University of Electro-Communications, Tokyo 182-8585, Japan/JST CREST, Tokyo
4.
Faculty of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto 606-8522
5.
Department of Mathematical Information Science, Tokyo University of Science, Tokyo 162-8601
6.
Graduate School of Informatics, Kyoto University, Kyoto 606-8501

Received: November 30, 2013

Revised: November 30, 2013

Published: October 2015

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Abstract

In this paper, conserved quantities of the discrete hungry Lotka-Volterra (dhLV) system are derived. Our approach is based on the Lax representation of the dhLV system, which expresses the time evolution of the dhLV system as a similarity transformation on a certain square matrix. Thus, coefficients of the characteristic polynomial of this matrix constitute conserved quantities of the dhLV system. These coefficients are calculated explicitly through a recurrence relation among the characteristic polynomials of its leading principal submatrices. The conserved quantities of the discrete hungry Toda (dhToda) equation is also derived with the help of the Bäcklund transformation between the dhLV system and the dhToda equation.

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Mathematics Subject Classification: Primary: 37K10; Secondary: 39A99.

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