Eric Weisstein's World of Science is written and maintained by the author as a public service for scientific knowledge and education. Although it is often difficult to find explanations for technical subjects that are both clear and accessible, this web s
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The NOVA mini-series The Elegant Universe, watch all three one hour episodes here, divided into chapters, available in the QuickTime or RealPlayer plug-ins.
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Cambridge University Press by Paul Taylor - Practical Foundations collects the methods of construction of the objects of twentieth century mathematics, teasing out the logical structure that underpins the informal way in which mathematicians actually do