Yeah, I asked it on reddit aswell, yet I am basically a newcommer on SR and I don't really have a clue what is meant by that. Maybe that you can elaborate any further?
Something that has been bothering me for a while is this question. As seen from this Minkowski diagram,http://imgur.com/GkBN2HQ , the angle between x and x' is equally big as the angle between ct and ct'. I really can't seem to figure out why this is, although I think it has to do with the...