Good condition. Just bought it because I'm a physics major and wanted something to read on my down time.<br><br>The material is real. Lots of heavy math. Calculus and matrices and things like that.<br>Conceptually, it's a gold mine, but the information could have been presented in a more upfront manner where as it's a little scattered in a few sections. Then again, it's physics, wouldn't expect any less. Definitely worth the buy. Reading from volume 1 to 3 sequentially is a journey and very rewarding if you make it through.