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Hamiltonian systems, symplectic flows, classical integrable systems

64 votes

What is a Lagrangian submanifold intuitively?

I want to answer the question "why should I care about Lagrangians" by showing how they arise when you try to answer a very natural question which in some sense lies at the heart of classical mechanic …
Joel Fine's user avatar
  • 6,247
10 votes
Accepted

Cotangent bundle of a submanifold

It is possible to see the cotangent bundle of the submanifold as a kind of symplectic reduction of the cotangent bundle of the ambient manifold. I think it might be enough to explain the analogous fac …
Joel Fine's user avatar
  • 6,247
20 votes
Accepted

look into Delzant Polytope

The standard model of a vertex which satisfies the Delzant condition is the positive "quadrant" $x_i \geq 0$ of $\mathbb{R}^n$ near the origin. In general a polytope is Delzant if and only if every ve …
Joel Fine's user avatar
  • 6,247