I have an old edition of the book which makes the current edition expendable and it still fetches a fair price because it is still used in the classroom. The only other math/physics book I sold was my calculus book which I kinda regret but then again I have 2 other books on calculus (albeit at a much higher level). It isn't all that advanced of a book title is "Advanced Engineering Mathematics" it starts off covering ODEs covers some linear algebra and vector calculus (none of which someone taking the class hasn't seen before) then it goes on to PDEs and Fourier analysis some complex analysis and on from there. It would be this book here http://www.bkstr.com/webapp/wcs/stor...purpose=browse