Conserved quantities of the integrable discrete hungry systems

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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)889-899
Number of pages11
JournalDiscrete and Continuous Dynamical Systems - Series S
Issue number5
Publication statusPublished - 2015 Oct 1


  • Characteristic polynomial
  • Conserved quantities
  • Discrete hungry Lotka-Volterra system
  • Discrete hungry Toda equation
  • Leading principal submatrix

ASJC Scopus subject areas

  • Analysis
  • Discrete Mathematics and Combinatorics
  • Applied Mathematics


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