Just a quick note: for those who might have been interested in my textbook, Mathematical Methods for Optical Physics and Engineering, but who found the list price a bit expensive, Cambridge University Press is selling it for 30% off until April 30th!

If my calculations are correct, £38.50 = $62, so it’s quite inexpensive right now — grab a copy while you can!

I should also note that Cambridge has put a large number of books in their optics catalog at 30% off until the end of the month. Some great titles looks to be available for really cheap (including mine).

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Wow, it’s still expensive for me despite 30% off! Haha!

By the way, deer prof. The extra set of problems is available now? To be honest, I felt a little hard to continue reading your book without practice, because I can’t keep in mind some formulas, like those in Chapter 3.

Hi — haven’t had time to work on extra problems yet — it’s been a crazy semester! Still hoping to do some more book-related work over the summer, which will start next week.

Anyway, thanks again, professor! And expecting your new excellent book, Haha!