Bought this book to help with the math in a numerical data analysis/numerical simulation class made for chemists. It's a very helpful book with nice, succinct overviews of major mathematical topics from statistics to fundamental calculus. The problems are very application oriented so it's easy to go straight from a lesson to working problems. Their are also helpful references given so that the reader can go elsewhere for more in-depth coverage of a topic. Delivery was fast and condition of the book was very good, despite it's "used" status.