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MathWorld is an online mathematics reference work, created and largely written by Eric W. Weisstein. [ 2 ] [ 3 ] It is sponsored by and licensed to Wolfram Research, Inc. and was partially funded by the National Science Foundation 's National Science Digital Library grant to the University of Illinois at Urbana–Champaign .
PlanetMath was started when the popular free online mathematics encyclopedia MathWorld was temporarily taken offline for 12 months by a court injunction as a result of the CRC Press lawsuit against the Wolfram Research company and its employee (and MathWorld's author) Eric Weisstein.
The CRC Press claimed MathWorld violated the copyright on the CRC Concise Encyclopedia of Mathematics. During the dispute, a court order shut down MathWorld for over a year starting October 23, 2000. According to Eric Weisstein's personal site, he restarted MathWorld on November 6, 2001. [1] This ultimately led to the creation of PlanetMath. [2]
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A number of different units of measurement were used in Sri Lanka to measure quantities like length, mass and capacity from very ancient times. [1] Under the British Empire, imperial units became the official units of measurement [2] and remained so until Sri Lanka adopted the metric system in the 1970s.
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The smallest (and unique up to rotation and reflection) non-trivial case of a magic square, order 3. In mathematics, especially historical and recreational mathematics, a square array of numbers, usually positive integers, is called a magic square if the sums of the numbers in each row, each column, and both main diagonals are the same.