# Math Help - formal notation

1. ## formal notation

I have been studying lagrangian and hamiltonian mechanics, and I found some resources online that are very rigorous and formal. I don't understand how to read the definitions.

http://www.ks.uiuc.edu/Services/Clas...m_PDF/chp1.pdf

You can see in the document that they start by defining a functional, and then they define differentiability of a functional, and so on. I just don't understand all of the notation. Are there any online sources that I can turn to? Where can I learn this notation?

2. What notation are you experiencing trouble with? $\partial$ ? $\int$?