Math Guide is available through the Google Play store in all countries I can make it available in.* Now that the 2nd edition is available in this format, I've taken the 1st edition out of the store.
You can read Google Play books on your tablet (Android, iPad, etc.), or your computer. Technically, you can read them on your phone, too, but I wouldn't recommend trying to read my book that way.
If you like to read your math books from a screen—or if you live in a country where you can't get your hands on a print copy—click here.
* As of this posting, Google Play books are available in: Australia, Austria, Belgium, Brazil, Canada, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, India, Ireland, Italy, Japan, Mexico, Netherlands, Poland, Portugal, Romania, South Korea, Spain, Sweden, Russia, United Kingdom, United States