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abacists Abel algebraic equations analytic Apollonius appeared Arabs Archimedes arithmetic Aryabhatta astronomer Bernoulli bers Born calculation called Cantor Cauchy Cayley century Chasles circle Clebsch coefficients computation conic sections conics construction continued fractions Coss cube curves decimal Descartes determined died differential equations Diophantus division elementary elliptic functions elliptic integral equa especially Euclid Euler example expression Fermat figures formulae fractions Gauss geometry German Geschichte given Greek Hindu infinite integral investigations irrational numbers Jacob Bernoulli Jacobi John Bernoulli known later Leibnitz linear logarithms mathe mathematicians mathematics method metic metric Mobius multiplication Newton period plane polygons prime number problem quadratic quadratrix quantities rational Regiomontanus regular represented right angle Roman Rudolff rule second degree second order seventeenth sexagesimal sine solution solved spherical square root Stifel straight line subtraction surfaces symbols tables tangents Theon of Alexandria theorem theory of numbers third tion triangle trigonometry Wrote
Page 121 - If all points of the straight line fall into two classes such that every point of the first class lies to the left of every point of the second class, then there exists one and only one point which produces this division of all points into two classes, this severing of the straight line into two portions.
Page 280 - But mathematics have never been cultivated more zealously and diligently, or with greater success, than in this century— in the last half of it or at the present time ; the advances made have been enormous, the actual field is boundless, the future full of hope. In regard to pure mathematics we may most confidently say : " Yet I doubt not through the ages one increasing purpose runs, And the thoughts of men are widened with the process of the suns.
Page 335 - Price, $i oo net (5s.). DE MORGAN, AUGUSTUS. ON THE STUDY AND DIFFICULTIES OF MATHEMATICS. New Reprint edition with notes. Pp. viii+288. Cloth, $1.25 net (5s.).
Page 157 - At the end of the seventeenth and the beginning of the eighteenth century...
Page 336 - Cloth, $1.25 (6s. 6d.). KARMA. A STORY OF EARLY BUDDHISM. Illustrated by Japanese artists.
Page 336 - Edition. Cloth, $1.oo (5s.). THE GOSPEL OF BUDDHA. According to Old Records.
Page 73 - The square of a positive number as also of a negative number is positive and the square root of a positive number is two-fold, positive and negative. There is no square root of a negative number, for this is not & square.
Page 270 - ... then the lines are not parallel, but meet on that side of the transversal on which the sum of the interior angles is less than a straight angle. For the lines cannot be parallel, by prop. XVII and cor. 2. Further, suppose Z c + Z b' < st. Z ; then •/ Z a' + Z &' = st. Z , it follows that Z c < Z a'. .•. P and P' cannot meet towards P', for then Z c would be greater than Z a', prop.
Page 229 - Among the predecessors of Descartes we reckon, besides Apollonius, especially Vieta, Oresme, Cavalieri, Roberval, and Fermat, the last the most distinguished in this field; but nowhere, even by. Fermat, had any attempt been made to refer several curves of different orders simultaneously to one system of coordinates, which at most possessed special significance for one of the curves. It is exactly this thing which Descartes systematically accomplished.