Symplectic Conservative Approximation for Discrete Dynamics Integration

Symplectic conservation should be confirmed after discrete integration for dynamics. Symplectic symmetry is from Hamilton canonical equation and its variational principle is the minimum action variational principle. Symplectic conservative approximation is confirmed after discrete, and it should not be replaced by inaccurate concept such as structure-preserving. Symplectic conservation was proposed by Kang Feng, which should be taken seriously.