Difference Discrete Variational Principles,Euler—Lagrange Cohomology and Symplectic,Multisymplectic Structures I：Difference Discrete Variational Principle  

作　　者：GUOHan－Ying WUKe 等 

机构地区：[1]InstituteofTheoreticalPhysics,AcademiaSinica,P.O.Box2735,Beijing100080,China

出　　处：《Communications in Theoretical Physics》2002年第1期1-10,共10页理论物理通讯（英文版）

基　　金：国家自然科学基金，国家重点基础研究发展计划(973计划)

摘　　要：In this first paper of a series, we study the difference discrete variational principle in the framework of multi-parameter differential approach by regarding the forward difference as an entire geometric object in view of noncommutative differential geometry. Regarding the difference as an entire geometric object, the difference discrete version of Legendre transformation can be introduced. By virtue of this variational principle, we can discretely deal with the variation problems in both the Lagrangian and Hamiltonian formalisms to get difference discrete Euler-Lagrange equations and canonical ones for the difference discrete versions of the classical mechanics and classical field theory.

关 键 词：变分原理 欧拉拉格郎日上同伦 合成结构 

分 类 号：O176[理学—数学] O316[理学—基础数学]