This section includes problems, "solutions," errata, Mathcad programs, and related checks to the hundreds of equations in my book.  Most of the "solutions" to the problems are actually student solutions (with the names marked out).  For the more difficult problems, I frequently provided my students with hints and guidance.  In some cases, I have includes multiple student solutions, which might not agree with each other, or even be complete.  In other cases, I have included my partial solution to the problem.   Unfortunately, as new problems were added over the years, the labels have also changed. However, I have tried to order the solutions.  Note that there might be mistakes in these solutions.