Recent content by Mark Hadley

Here the distinguishing feature of a reflection is that it is a transformation with a determinant of -1 as opposed to +1 . Fortunately in 3D an inversion ##x \rightarrow -x## treats all directions equally and has determinant -1. Unlike a mirror refection, it is isotropic. That makes it a very...

Schrödinger's equation is derived neatly in Ballentine's book on quantum theory. While Weinberg derives the relativistic equations in volume 1. They start from the probability rules and then look at the effects of continuous symmetry operations. Why the probabilities are given by a quadratic...