As you may have noticed, the solutions to some exercises are password-protected. This is to enable instructors to assign these as problems in their classes, and grade the resulting student work against authoritative solutions that we provide.
We will therefore provide access to these solutions only to people who go through a careful vetting to ensure that they are in a bonafide instructor role. If you are one, feel free to contact us. If you are not, however, please don't waste our time! (We've seen enough fake claims, manufactured “id card”s, etc., that it's pretty unlikely you'll get past us.)
We recognize that some of you are reading this material as self-learners. We respect that and want to help you, too! We will therefore make the solutions to roughly half our exercises available without any password protection, so you can use them to check your work.