Trigonometric Delights. This book is neither a textbook of trigonometry—of which there are many—nor a comprehensive history of the subject, of which there is almost none. It is an attempt to present selected topics in trigonometry from a historic point of view and to show their relevance to other sciences. It grew out of my love affair with the subject, but also out of my frustration at the way it is being taught in our colleges.
posted by Wolfdog on Mar 24, 2010 - 18 comments

Open Text Book: a blog which lists freely-available online textbooks. [more inside]
posted by Upton O'Good on Oct 25, 2007 - 12 comments

Review of Five Free Calculus Texts.
posted by weston on Mar 8, 2004 - 14 comments

Euclid's Elements - the ancient Greek mathematicians textbook, presented here with the aid of Java, including Pythagoras' Theorem, and proof that there is an infinite amount of prime numbers.
posted by Orange Goblin on Jan 3, 2004 - 2 comments