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Friday the 13 th and the Mathematics of the Gregorian Calendar

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Friday the 13 th and the Mathematics of the Gregorian Calendar

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The January 1968 issue of The Mathematics Teacher contained a fas cinating expository paper on “Continued Fractions.”1 It does not appear to be generally known that, until about 30 years ago, the subject called “continued fractions” was the province of a handful of “pure” mathematicians who could not abide the countless applications of their beloved discipline to science, engineering, and technology, and occupied themselves with continued fractions because they believed this to be the one area of mathematics which had no possible applications. The employment of continued fractions in other branches of mathematics was not considered to be applications; that there are many of these, however, can be seen from only a cursory glance through the National Bureau of Standards Handbook of Mathematical Functions.2
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