Virtual Polyhedra: The Encyclopedia of Polyhedra
by George W. Hart
Polyhedra have an enormous aesthetic appeal and the subject is fun and easy to learn on one's own. This is a collection of thousands of virtual reality polyhedra for you to explore. There are hundreds here which have never been illustrated in any previous publication.
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by Daniel Callahan - starrhorse.com
Euclid's 'Elements' Redux is an open textbook on mathematical logic and geometry for use in grades 7-12 and in undergraduate college courses on proof writing. It is a new edition of the most successful textbook of all time...
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