Hi, this is my first post. I did a search and in this sub-forum I found the most related threads for what I'm looking for. I need some guidance or where or how to learn all this mathematics for velocity-phase space integrals that appear in Maxwellian distributions. I'm an Engineer in Electronics and Communications, taking an advanced course on Kinetic Theory and I'm having this mathematical problems as I don't have much background on Physics. I have already taken courses in vector calculus, differential equations and integration methods (basic) Please Advise. Thanks a lot.