我们知道有限元方法以及辛算法和多辛算法是解偏微分方程数值解的重要方法。
We all know that both finite element method (FEM), symplectic algorithm and multi-symplectic algorithm are powerful tools to solve partial differential equations numerically.
同时，电磁波导的辛分析也是构造对偶有限元的理论基础。
Moreover, symplectic analysis for electromagnetic waveguides provides the theoretical basis for constructing dual finite element method (FEM).
类似，对于混合有限元格式，是否也存在某种辛和多辛结构，这是本文研究的重点问题。
Similarly, whether the mixed finite element schemes also have some hidden symplectic and multisymplectic structures is the important problem which has been discussed in this paper.
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