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    <p>"General Theory" of CAS is a pretty huge scope for a question. That being said, I'll do my best to cover as much as I can in the hopes that something helps you find what you're looking for :)</p> <p>The proceedings of the ISSAC and SIGSAM groups would no doubt have some good stuff about techniques for building CAS systems. A list of various topics in the general area of CAS building is available here: <a href="http://www.cs.berkeley.edu/~fateman/algebra.html" rel="noreferrer">http://www.cs.berkeley.edu/~fateman/algebra.html</a></p> <p>If you're more looking for information on how to code some of the math involved, I'm a fan of the "Numerical Recipes" series; it provides sample code and a reasonably decent explanation of math in a wide range of topics. Last I checked, an online version of an older revision of the book was available here: <a href="http://www.nrbook.com/a/bookcpdf.php" rel="noreferrer">http://www.nrbook.com/a/bookcpdf.php</a> (Note that this is the "Numerical Recipes in C" form of the book; there are versions in other languages as well).</p> <p>For building a CAS in general, one place to start might be here: "Building a computer algebra environment by composition of collaborative tools" by Kajler and Safir; Another place you might check is here: <a href="http://www.math.wpi.edu/IQP/BVCalcHist/calc5.html" rel="noreferrer">http://www.math.wpi.edu/IQP/BVCalcHist/calc5.html</a> where a high-level description of how a few folks implemented a CAS is listed.</p> <p>The other thing you might try is diving into the code for a few of the open source CAS projects that exist: YACAS (Yet Another Computer Algebra System : Java), Axiom, etc. I like the list here: <a href="http://en.wikipedia.org/wiki/List_of_computer_algebra_systems" rel="noreferrer">http://en.wikipedia.org/wiki/List_of_computer_algebra_systems</a></p> <p>Hope something in there was useful!</p>
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    1. COThanks for the info, I'll check the links out and maybe pester you for some more info in the future.
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