A very detailed, analytical presentation of Fourier series and Chebyshev spectral methods, very detailed, with excellent graphics/graphs and clear explanations. It contains 23 chapters and six appendices. A very valuable reference textbook. Free on line download at:
http://www-personal.umich.edu/~jpboyd/aaabook_9500may00.pdf
Rights:
"The copyrights for versions of this site from 1993 are dedicated to the public domain, as of January 1, 2008. This is a complete, and irrevocable, dedication of those copyrights."
http://www-personal.umich.edu/~jpboyd/aaabook_9500may00.pdf
http://onlinebooks.library.upenn.edu/licenses.html
http://onlinebooks.library.upenn.edu/webbin/book/browse?