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Hamiltonian systems, symplectic flows, classical integrable systems

21 votes
3 answers
2k views

When is a coadjoint orbit an integrable system (in a weak sense explained below)?

Let $X$ be an affine holomorphic symplectic variety of dimension $2n$, with the associated Poisson bracket { , }. Let's say it's an integrable system when there are $n$ algebraically independent holom …
Yuji Tachikawa's user avatar
7 votes
4 answers
2k views

Why does Hom need an identity in the definition of the category?

I was studying the axioms of a category, and noted that one axiom says there is an element $1_X\in Hom(X,X)$ for any object $X$ which serves as the identity. Why is this axiom necessary? What happens …
Yuji Tachikawa's user avatar
26 votes
5 answers
11k views

What does the word "symplectic" mean?

I know the definition of symplectic structure, symplectic group, and so on. But what does the word "symplectic" itself mean? Meta question: I have many other mathematical words whose etymologies are …
Yuji Tachikawa's user avatar
12 votes
1 answer
1k views

What is the "symplectic duality" between holomorphic symplectic manifolds? Where can I read ...

I'm recently working on something called 3d mirror symmetry in QFT literature, which involves two hyperkähler manifolds. There seems to be a corresponding(?) mathematical theory called symplectic dua …
Yuji Tachikawa's user avatar