Book ofProofs (BoP) is a site for professional and enthusiast mathematicians. This site is unique on the web. Here is how:
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BoP's mission is to explain deep mathematical results and concepts gained through the centuries to a broad public in an easy to understand way...
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It is built and run by you. No matter, whether you are a hobbyist or a professional, with your only it can become an outstanding math website.
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...still fulfilling modern standards of mathematical formalism and preciseness so that even professionals can use it as a free and exhaustive reference.