منابع مشابه
Bells, Motels and Permutation Groups
This article is about the mathematics of ringing the changes. We describe the mathematics which arises from a real-world activity, that of ringing the changes on bells. We present Rankin’s solution of one of the famous old problems in the subject.
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Previous progress towards instituting carbon emission caps in the US have been derailed by fears (voiced most prominently by the current administration) that such regulations would stifle the American economy. There has been progress, however, as exemplified by the bipartisan support for the Lieberman– Warner Climate Stewardship Act, which, while not reaching a full vote by the Senate this year...
متن کاملGroups and Bells
We describe the mathematics which arises from a real-world activity, that of ringing the changes on bells. We present Rankin's solution of one of the famous old problems in the subject, and some open questions.
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Bell’s palsy is a relatively common disease characterized by the sudden onset of unilateral facial paralysis. Using a centralized system that contains demographic data, the authors estimated rates, trends, and demographic risk of Bell’s palsy during a 2-year period. There were 140 incident cases of Bell’s palsy among patients referring to private clinics (a total of 6500 patients). The crude in...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1878
ISSN: 0036-8733
DOI: 10.1038/scientificamerican02161878-1759dsupp