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MathWorld
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<p><i>MathWorld</i> is an online <a href="/facts/Mathematics/pxTouaz4">mathematics</a> reference work, created and largely written by <a href="/facts/Eric_W._Weisstein/FbMuVDep">Eric W. Weisstein</a>. It is sponsored by and licensed to <a href="/facts/Wolfram_Research%2c_Inc./rDU0dXdE">Wolfram Research, Inc.</a> and was partially funded by the <a href="/facts/National_Science_Foundation/FlDT8TbW">National Science Foundation</a>'s <a href="/facts/National_Science_Digital_Library/FRerFsPy">National Science Digital Library</a> grant to the <a href="/facts/University_of_Illinois_at_Urbana%25E2%2580%2593Champaign/gusw7HoS">University of Illinois at Urbana–Champaign</a>. </p>