I think the formula (3.36) in your book should read “v’=qvq^{-1}”, because this is the formula for rotation of vectors, and the former formula (3.36) is for rotation of frames. So the last equation on the bottom of page 36 should also be corrected, then the (3.45) should read “v’_x=cos(2\theta), v’_y=sin(2\theta), v’_z=0” and so on the (3.46). Therefore we can get the consistent results with (3.24)(the corrected form from your errata).

BTW, you wrote a very delightful book, thank you!

Best,

Jia-Ji

I mail you for two purposes; first, to see if I can get the bonus chapter. Second, too let you know what I think of it anyway.

Sadly, I can’t leave a review on Amazon; Amazon has no payment options I can use, so I can’t leave reviews (requires more than one purchase).

However, I have shared the book on my page [https://www.facebook.com/daimonie/posts/914756001950273].

Now, more importantly I’d like to tell you what I think of it. I’m a M.Sc. student in Delft, currently doing a research project of only 6 weeks. I have to do two of these for my rather strange M.Sc. program. The research project is at the Lorentz Instute in Leiden, and contrary to delft they do deal with theoretical physics, specifically quantum field theory, group theory and general relativity. Delft mostly focuses on nano-devices in the master program, so sadly these topics are missing.

The Leiden group I’m working with/at/for gave me a text on group theory, but it seems to be written for mathematicians rather than physicists. I was rather bored with it, and couldn’t make much progress. I decided to hit the library for an e-book that was better fit for me. Group theory, as keywords, didn’t bring up much; but physics symmetry immediately yielded your book. Looking into it, I found a very modern website, an interesting preface and decided to download the book.

I’m now at page 60, after a day. I’m enjoying the writing style – it is indeed very well suited to somebody that hasn’t got much introduction into it. I particularly like going from simple definition to abstract mathematical definition and back. The few errors that I did spot are already in your errata, so well done.

What I would want to know, and what is missing from your author information, is where you are in your education. You mention working on a thesis, which would indicate a Master or Ph.D. student.

Either way, well done on writing the book. My sincere thanks for that!

– Josko Daimonie