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Maxima is a fairly complete computer algebra system written in lisp with an emphasis on symbolic computation. It is based on DOE-MACSYMA and licensed under the GPL. Its abilities include symbolic integration, 3D plotting, and an ODE solver.

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Free Lecture Notes, Syllabus, Tutorials, Audio and Video from MIT professors. All Free. No registration. | MIT OpenCourseWare | ocw.mit.edu

Scientific Literature Digital Library incorporating autonomous citation indexing, awareness and tracking, citation context, related document retrieval, similar document identification, citation graph analysis, and query-sensitive document summaries. ...

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