I have not yet finished the book, but I have got quite enough into it to see that it explains in an accessible manner the real importance of symmetry in physics.<br><br>I actually received a PhD in particle physics in 1967, but at the time there was not yet a course in this subject at my school. Having left physics in 1973, I am now, in my retirement, looking to understand what has been going on since, which is quite a lot. And this books explains it, with enough math to understand, but not so much as to snow you under.<br><br>Since then, I have purchased another of Mr Schwichtenberg's books, the one on quantum field theory, which I am reading in parallel. It too is a marvel.<br><br>Thank you, Mr Schwichtenberg! Danke vielmals, Jakob