# Tag Info

### "Constrain then quantise" vs. "quantise then constrain"

The phrase "quantization commutes with constraints" usually refers to Guillemin-Sternberg conjecture. It has only been proved for a limited class of (gauge) theories. It should stressed that ...
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### Derivation of Hamilton-Jacobi (HJ) Equation

Hamilton's principal function$^1$ $S\equiv F$ is the sole unknown variable in HJ equation. E.g. in contrast the Hamiltonian $H$ is assumed to be known. That's how separation of variables (SOV) work. ...
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### What are good books/chapters of books or articles to study canonical transformations in quantum mechanics at a graduate level?

I am unaware of many detailed resources in the area targeted towards typical physics graduates. However, there is a CRM monograph dealing with the Function Theory on Symplectic Manifolds which is ...

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