Derivations Definition and 103 Threads

I'm taking a first course in modern physics and were currently discussing special relativity. My professor keeps using four-vectors in derivations and proofs, and requires us to use them, but he hasn't developed the theory behind them; that is he's only showed us how to manipulate them. The...

Simple algebra, derivations, integrations. Desperate need of help :) Hi! This is my first post here (and it's not a very funny one). :) It's been a long time since I took any math, and I'm getting more and more confused. Need some help! a'*m' = b'*m a*m' = b*m b-b'=(a-a')*(m/m')...

Blarg. I have no idea how to do this thing. Can anyone give me some good links so I can read up on it? Like lessons and stuff. Because my teacher is very inadequate.