Titlebook: Number Story; From Counting to Cry Peter M. Higgins Book 20081st edition Springer-Verlag London 2008 Counting.Magic.Number theory.cryptogra

不規(guī)則的跳動

Some Tricky Numbers,ter. Another pair of numbers that captured the public imagination was 220 and 284, the first ., meaning that the sum of the factors of each summed to the other—a kind of perfection extended to a couple. Parted lovers would each carry an ornament decorated with one or other of these numbers as a toke

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Some Useful Numbers,er to things such as growth, or to a certain proportion of the population, but at the same time we do not much like fractions—even talking in terms of decimal fractions is awkward in ordinary conversation. The notion of percentage is a simple idea that comes to the rescue. All of us prefer whole num

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Glimpses of Infinity,d square roots as they were identified with lengths in euclidean geometry. At the same time they hankered after an understanding of cube roots, which seemed to reside at another level in the hierarchy that they were reluctant to recognize, for they could find no satisfactory way of getting to grips

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Applications of Number: Chance, hand it is found in advanced theoretical physics and economics, and on the other it has percolated down into the beginning of school study. Up until the latter part of the 18th century, it was not properly recognized as an area of applied mathematics. Although chance and games of chance have been w

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Application of Number: Codes and Public Key Cryptography,d there seems to be little that you have all your own that adults cannot gain access to and take away if they choose. Having your own way of communicating with one or two trusted friends that no-one else can understand gives little ones a rare chance to walk tall, and feel superior in a world not ev

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