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28 June 2011 Last updated at 08:46 GMT By Jason Palmer Science and technology reporter, BBC News Fans of tau suggest it makes more sense than pi when describing fractions of a circle The mathematical constant pi is under threat from a group of detractors who will be marking "Tau Day" on Tuesday. Tau Day revellers suggest a constant called tau should take its place: twice as large as pi, or about 6.28 - hence the 28 June celebration. Tau proponents say that for many problems in maths, tau makes more sense and makes calculations easier. Not all fans of maths agree, however, and pi's rich history means it will be a difficult number to unseat.
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