By Herman. H. Goldstine

ISBN-10: 1461381061

ISBN-13: 9781461381068

ISBN-10: 1461381088

ISBN-13: 9781461381082

The calculus of diversifications is a topic whose starting could be accurately dated. it'd be stated to start in the intervening time that Euler coined the identify calculus of diversifications yet this can be, in fact, no longer the genuine second of inception of the topic. it can now not were unreasonable if I had long gone again to the set of isoperimetric difficulties thought of by way of Greek mathemati cians equivalent to Zenodorus (c. 2 hundred B. C. ) and preserved by means of Pappus (c. three hundred A. D. ). i have never performed this on the grounds that those difficulties have been solved through geometric capacity. as an alternative i've got arbitrarily selected first of all Fermat's dependent precept of least time. He used this precept in 1662 to teach how a gentle ray used to be refracted on the interface among optical media of other densities. This research of Fermat turns out to me in particular acceptable as a place to begin: He used the equipment of the calculus to reduce the time of passage cif a gentle ray during the media, and his procedure used to be tailored via John Bernoulli to resolve the brachystochrone challenge. there were a number of different histories of the topic, yet they're now hopelessly archaic. One by way of Robert Woodhouse seemed in 1810 and one other through Isaac Todhunter in 1861.

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**Example text**

Bernoulli next goes on to show, as did Newton, that giv~n two points A and B there always is a cycloid through those points. Bernoulli exclaimed that "Nature tends always to proceed in the simplest way" when he noted that his brachystochrone and Huygens's tautochrone are the same curve. fl _ X 2 / 3 From this we find by integrating that y - c = -(2 + x 2/ 3)(1 _ x2/3)1/2 and a little manipulation shows this is expressible as an algebraic equation in x and y of degree 6. 49 John Bernoulli, 00, Vol.

Let us, therefore, extract merely the essence of his proof. 17 Leibniz has the points A, B, C, and E fixed bat wishes to allow D to move on the line through E parallel to the base so that the time of descent along the path made up of AD and DB will be a minimum. To this end he first finds that 46Leibniz, LMS, Part I, Vol. III, pp. 290-295. 6. 31) that lAD AD = AE 'r, IDB DB = EC ·n. , AD2 = AE2 + ED2, DB2 = EC 2 + FB2 = EC 2 + (CB - ED)2. From these it follows easily that ED FB r' AD. 18, in which he has plotted a parabola AE with vertex at A and axis AB so that a particle which falls from A to B vertically arrives there in the time BE.

To this end we first give his 1694 version and only later his 1685 one. Newton wrote out for Gregory the details of his demonstration of his assertion in the Principia scholium, indicated earlier (p. 12), in a letter dated 14 July 1694. Whiteside tells us that the original document was damaged in a number of places but was first restored by John Couch Adams, the astronomer, in 1888 in an unsatisfactory way, and then later by Bolza in 1912/13. 14) He says that the resistances of the surfaces generated by revolving the small lines Gg and Nn are proportional to BG I Gg 2 and MN I Nn 2 , as we 30See the preface by Adams, CAT, pp.

### A History of the Calculus of Variations from the 17th through the 19th Century by Herman. H. Goldstine

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