I was wondering if anyone knew of a text or website that has a very indepth explanation of the triangle inequality and its variations really just how to apply it with limit proofs. I mean i understand it in terms of a triangle as no one side can be longer than the sum of the two other sides, but im more interested in the explanation in terms of the real line. Also what about this max(a,b) and min(a,b) notation i keep seeing? I never seen it used in my precalculus studies. Im guessing that it denotes the largest or smallest member of a set? Is that really all there is too it? Basically i want to master all the prerequiste skills that i will need to seriously study and understand limits. Any advice would be great.