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Hamiltonian systems, symplectic flows, classical integrable systems

78 votes
10 answers
18k views

What is a Lagrangian submanifold intuitively?

What are good ways to think about Lagrangian submanifolds? Why should one care about them? More generally: same questions about (co)isotropic ones. Answers from a classical mechanics point of view …
Jan Weidner's user avatar
  • 13.2k
50 votes
4 answers
16k views

What is a symplectic form intuitively?

Hi, to completely describe a classical mechanical system, you need to do three things: -Specify a manifold $X$, the phase space. Intuitively this is the space of all possible states of your system. …
Jan Weidner's user avatar
  • 13.2k
24 votes
3 answers
3k views

Classical mechanics motivation for poisson manifolds?

Suppose I want to understand classical mechanics. Why should I be interested in arbitrary poisson manifolds and not just in symplectic ones? What are examples of systems best described by non sympl …
Jan Weidner's user avatar
  • 13.2k
6 votes
2 answers
1k views

Two versions of hamiltonian reduction

Given a symplectic manifold $X$ with nice $G$ action, equivariant momentmap $\mu$ and invariant $\chi \in \mathfrak{g}^*$ which is a regular value of $\mu$. There are two ways to form the Hamiltonia …
Jan Weidner's user avatar
  • 13.2k