Abstract
THIS work is by the author of “Exponentials Made Easy ” and is in the same colloquial and humorous style, with chapter headings like “Where We meet again an Old Acquaintance, and with its Help, venture into a Maze and discover a Treasure Buried therein”. On p. 294 we are told that “Infinity is a mysterious region: there things happen which do not happen anywhere else. There, for example, parallel straight lines meet, a thing which no properly brought-up parallel straight lines will ever do elsewhere (in Euclidean geometry). . . .” The first volume gives the ordinary mathematics of complex numbers, exponentials, hyperbolic functions, and the easier parts of analytical trigonometry, but in much more detail than usual, as the author is writing for engineers of limited mathematical powers. The proofs on pp. 64-66 are given without any mention of their weak points. The second volume, dealing with the application of hyperbolic functions, appears to be much more valuable. Most of it is concerned with electrical engineering; the rest deals with geography, navigation, strength of materials, suspension bridges, and cables.
Elementary Hyperbolics: for Technical and other Students; specially adapted to the Requirements of Beginners.
M. E. J. Gheury
de Bray
By. In 2 vols. Vol. 1: Hyperbolic Functions of Real and Unreal Angles. Pp. xi + 351. Vol.2: The Applications of Hyperbolic Functions. Pp. xii + 209. (London: Crosby Lockwood and Son, 1931.) 7s. 6d. each vol.
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P., H. Elementary Hyperbolics: for Technical and other Students; specially adapted to the Requirements of Beginners . Nature 128, 1026 (1931). https://doi.org/10.1038/1281026b0
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DOI: https://doi.org/10.1038/1281026b0