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Beck's theorem (disambiguation) : ウィキペディア英語版 | Beck's theorem (disambiguation) In mathematics, there are two (different) theorems (by two different mathematicians) which go under the name of Beck's theorem. * In category theory, Beck's monadicity theorem (also known as the Beck tripleability theorem), proven by J. M. Beck around 1967, gives necessary and sufficient conditions for a functor to be monadic. * In incidence geometry, Beck's theorem is a more quantitative form of the more classical Sylvester–Gallai theorem. It says that finite collections of points fall into one of two extremes; one where a large fraction of points lie on a single line, and one where a large number of lines are needed to connect all the points.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Beck's theorem (disambiguation)」の詳細全文を読む
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