- #1

Prez Cannady

- 21

- 2

**Summary::**Pretty sure they have something to do with path integrals, or what not. But obviously it's hard to *search* for this stuff.

Basically, I'm looking for a textbook, any textbook--physics, mathematics, etc.--that deals with integrals that look something like this (mistakes are mine):

[tex]S = \int dx^4 \Omega \, e^{i \int \mathcal{L} dt}[/tex]

Where [itex]S[/itex] is an action to be minimized, [itex]\Sigma[/itex] is just something integrable across the 4-volume and [itex]\mathcal{L}[/itex] is a Lagrangian. Ideally, looking for something that:

1. explains why the Lagrangian is in the exponent of [itex]e[/itex] like that and what it signifies, and

2. works an example of minimizing [itex]S[/itex].

Basically, just want to know where to start.