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October  2015, 8(5): 889-899. doi: 10.3934/dcdss.2015.8.889

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

Received  December 2013 Revised  December 2013 Published  July 2015

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.
Citation: Sonomi Kakizaki, Akiko Fukuda, Yusaku Yamamoto, Masashi Iwasaki, Emiko Ishiwata, Yoshimasa Nakamura. Conserved quantities of the integrable discrete hungry systems. Discrete & Continuous Dynamical Systems - S, 2015, 8 (5) : 889-899. doi: 10.3934/dcdss.2015.8.889
##### References:
 [1] LAPACK:, http://www.netlib.org/lapack/, ., (). Google Scholar [2] A. Fukuda, E. Ishiwata, M. Iwasaki and Y. Nakamura, The discrete hungry Lotka-Volterra system and a new algorithm for computing matrix eigenvalues,, Inverse Probl., 25 (2009). doi: 10.1088/0266-5611/25/1/015007. Google Scholar [3] A. Fukuda, E. Ishiwata, Y. Yamamoto, M. Iwasaki and Y. Nakamura, Integrable discrete hungry systems and their related matrix eigenvalues,, Annal. Mat. Pura Appl., 192 (2013), 423. doi: 10.1007/s10231-011-0231-0. Google Scholar [4] A. Fukuda, Y. Yamamoto, M. Iwasaki, E. Ishiwata and Y. Nakamura, A Bäcklund transformation between two integrable discrete hungry systems,, Phys. Lett. A, 375 (2011), 303. doi: 10.1016/j.physleta.2010.11.029. Google Scholar [5] R. Hirota, S. Tsujimoto and T. Imai, Difference scheme of soliton equations,, Sūrikaisekikenkyūsho Kōkyūroku, 822 (1993), 144. Google Scholar [6] M. Iwasaki and Y. Nakamura, On the convergence of a solution of the discrete Lotka-Volterra system,, Inverse Probl., 18 (2002), 1569. doi: 10.1088/0266-5611/18/6/309. Google Scholar [7] M. Iwasaki and Y. Nakamura, Accurate computation of singular values in terms of shifted integrable schemes,, Jpn. J. Indust. Appl. Math., 23 (2006), 239. doi: 10.1007/BF03167593. Google Scholar [8] T. Tokihiro, A. Nagai and J. Satsuma, Proof of solitonial nature of box and ball systems by means of inverse ultra-discretization,, Inverse Problems, 15 (1999), 1639. doi: 10.1088/0266-5611/15/6/314. Google Scholar

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##### References:
 [1] LAPACK:, http://www.netlib.org/lapack/, ., (). Google Scholar [2] A. Fukuda, E. Ishiwata, M. Iwasaki and Y. Nakamura, The discrete hungry Lotka-Volterra system and a new algorithm for computing matrix eigenvalues,, Inverse Probl., 25 (2009). doi: 10.1088/0266-5611/25/1/015007. Google Scholar [3] A. Fukuda, E. Ishiwata, Y. Yamamoto, M. Iwasaki and Y. Nakamura, Integrable discrete hungry systems and their related matrix eigenvalues,, Annal. Mat. Pura Appl., 192 (2013), 423. doi: 10.1007/s10231-011-0231-0. Google Scholar [4] A. Fukuda, Y. Yamamoto, M. Iwasaki, E. Ishiwata and Y. Nakamura, A Bäcklund transformation between two integrable discrete hungry systems,, Phys. Lett. A, 375 (2011), 303. doi: 10.1016/j.physleta.2010.11.029. Google Scholar [5] R. Hirota, S. Tsujimoto and T. Imai, Difference scheme of soliton equations,, Sūrikaisekikenkyūsho Kōkyūroku, 822 (1993), 144. Google Scholar [6] M. Iwasaki and Y. Nakamura, On the convergence of a solution of the discrete Lotka-Volterra system,, Inverse Probl., 18 (2002), 1569. doi: 10.1088/0266-5611/18/6/309. Google Scholar [7] M. Iwasaki and Y. Nakamura, Accurate computation of singular values in terms of shifted integrable schemes,, Jpn. J. Indust. Appl. Math., 23 (2006), 239. doi: 10.1007/BF03167593. Google Scholar [8] T. Tokihiro, A. Nagai and J. Satsuma, Proof of solitonial nature of box and ball systems by means of inverse ultra-discretization,, Inverse Problems, 15 (1999), 1639. doi: 10.1088/0266-5611/15/6/314. Google Scholar
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