I'm working on writing an open-source math textbook. You can find it at http://christopherolah.files.wordpress.com/2009/01/math1.pdf http://christopherolah.file

I'm working on writing an open-source math textbook. You can find it at http://christopherolah.files.wordpress.com/2009/01/math1.pdf http://christopherolah.files.wordpress.com/2009/01/math1.pdf . I'd love any feedback. It is very much a work in progress, though development will be rather slow until June...