Hello everyone

Can anyone please recommend a site (or book, e-book, etc) which explains partial differentiation in an easy manner? I just need to get the basic hang of it.

And the same for integrals such as:

$\displaystyle F(x,y) = \int^{x}_{- \infty} \int^{y}_{- \infty} f_{X}(u) f_{Y}(v) \ dv \ du $

What are such integrals called by the way? Double integrals?

Thanks in advance,

Janvdl