中国物理B ›› 2011, Vol. 20 ›› Issue (1): 10202-010202.doi: 10.1088/1674-1056/20/1/010202

• GENERAL • 上一篇    下一篇

Reductions and conserved quantities for discrete compound KdV–Burgers equations

何玉芳, 刘咏松, 傅景礼   

  1. Institute of Mathematical Physics, Zhejiang Sci-Tech University, Hangzhou 310018, China
  • 收稿日期:2010-03-08 修回日期:2010-09-25 出版日期:2011-01-15 发布日期:2011-01-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11072218 and 10672143).

Reductions and conserved quantities for discrete compound KdV–Burgers equations

He Yu-Fang(何玉芳), Liu Yong-Song(刘咏松), and Fu Jing-Li(傅景礼)   

  1. Institute of Mathematical Physics, Zhejiang Sci-Tech University, Hangzhou 310018, China
  • Received:2010-03-08 Revised:2010-09-25 Online:2011-01-15 Published:2011-01-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11072218 and 10672143).

摘要: We present two methods to reduce the discrete compound KdV–Burgers equation, which are reductions of the independent and dependent variables: the translational invariant method has been applied in order to reduce the independent variables; and a discrete spectral matrix has been introduced to reduce the number of dependent variables. Based on the invariance of a discrete compound KdV--Burgers equation under infinitesimal transformation with respect to its dependent and independent variables, we present the determining equations of transformation Lie groups for the KdV--Burgers equation and use the characteristic equations to obtain new forms of invariants.

Abstract: We present two methods to reduce the discrete compound KdV–Burgers equation, which are reductions of the independent and dependent variables: the translational invariant method has been applied in order to reduce the independent variables; and a discrete spectral matrix has been introduced to reduce the number of dependent variables. Based on the invariance of a discrete compound KdV–Burgers equation under infinitesimal transformation with respect to its dependent and independent variables, we present the determining equations of transformation Lie groups for the KdV–Burgers equation and use the characteristic equations to obtain new forms of invariants.

Key words: discrete compound KdV–Burgers equation, symmetry, reduction, invariant

中图分类号:  (Group theory)

  • 02.20.-a
02.30.Ks (Delay and functional equations)