# Basic Concepts and Theorems

• Tatiana G. Vozmischeva
Part of the Astrophysics and Space Science Library book series (ASSL, volume 295)

## Abstract

Let us consider a vector field on a smooth manifold. Let x 1, ..., x n be local coordinates, then we can write down the vector field in the form
$$\frac{{d{x^i}}}{{dt}} = {\xi ^i}\left( {{x^1}, \ldots ,{x^n}} \right),\quad i = n, \ldots ,n,$$
(1.1)
, where ξ i (x 1, ..., x n ) are smooth functions being the components of the field. Thus, each vector field is interpreted as a system of ordinary differential equations on a manifold. And conversely, each system of ordinary differential equations describes the vector field on the corresponding manifold. In classical mechanics a motion of a system can be described with the help of ordinary differential equations. Among mechanical systems there exists the important class of systems which are described by Hamiltonian equations. These systems are realized on symplectic manifolds.

## Keywords

Vector Field Hamiltonian System Bifurcation Diagram Poisson Bracket Symplectic Manifold
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.