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RIchard Von Mises introduceses idea of sample space into probability theory
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Fields Medals are given every 4 years to the most prominent mathematicians (40 and under)
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Jesse Douglas proves that the existence of a surface of minimal area is bounded by contour.
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George Dantzig introduces the simplex method of optimisation.
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Lars Hörmander begins theory. Accepts Field Medal 10 years later.
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Stephen Cook formulates P versus NP
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Louis de Brange solved it.
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Andrew John Wilis proves it.
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Thomas Hales proves on sphere packing.
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7 million dollars will be rewarded to the solution of seven mathematical problems called the "Millennium Prize Problems".