I just cut this from a university PDF file I found and just looking through. I understand absolutely nothing what is being said and I don't study physics in anyway. I can't even do algebra haha but I have a queston. Who invents this stuff? How can anyone remember all that stuff? How is it possible for someone to sit and think, then come up with such an equation or formula? More to the point, how many different types of symbols are there in physics lol. Just inventing more and more by the looks of it.