The Online Books Catalog from the University of Pennsylvania: An indexed catalog of over 25,000 online books. When you first visit this site it is easy to become overwhelmed and give up. The books are organized and indexed using the Library of Congress call number system. But take a few minutes, look around, learn how the search works. For adult learners, this resource can save trips to the nearest research library.
Linear Algebra: Jim Hefferon at St. Michael's College in Vermont has written a first class introductory Linear Algebra Text and put the entire book online. Linear Algebra by Jim Hefferon (pdf file for download along with a separate file containing the answers to all the exercises).
Linear Algebra: A First Course in Linear Algebra: Robert A. Beezer, the University of Puget Sound Another excellent introductory Linear Algebra text. This book can be download in several formats and feedback from readers is incorporated into the text on an ongoing basis. This process means that there are multiple versions and multiple formats available on the site. So you have to take a minute to read the instructions and find the one you want.
Why the Professor Can't Teach and the Dilemma of University Education: This book is poorly named but wonderfully written. This plea for the reform of mathematics education was written in 1977 but a reader not informed of that fact might well assume it to be brand new. In other words, little has changed.
Additional Online books and textbooks of Interest:
