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John Radford Young (Southwark, 1799 – Peckham, 1885) was a mathematician, professor and author, who was almost entirely self-educated. He was born of humble parents in London. At an early age he became acquainted with Olinthus Gilbert Gregory, who perceived his mathematical ability and assisted him in his studies. In 1823, while working in a private establishment for the deaf, he published ''An Elementary Treatise on Algebra'' with a dedication to Gregory. This treatise was followed by a series of elementary works, in which, following in the steps of Robert Woodhouse, Young familiarized English students with continental methods of mathematical analysis. In 1833, he was appointed Professor of Mathematics at Belfast College. When Queen's College, Belfast, opened in 1849, the presbyterian party in control there prevented Young's reappointment as Professor in the new establishment. From that time he devoted himself more completely to the study of mathematical analysis, and made several original discoveries. In 1847, he published in the ''Transactions of the Cambridge Philosophical Society'' a paper "On the Principle of Continuity in reference to certain Results of Analysis", and, in 1848, in the ''Transactions of the Royal Irish Academy'' a paper "On an Extension of a Theorem of Euler". As early as 1844, he had discovered and published a proof of Newton's rule for determining the number of imaginary roots in an equation. In 1866, he completed his proof, publishing in ''The Philosophical Magazine'' a demonstration of a principle which in his earlier paper he had assumed as axiomatic. In 1868, he contributed to the ''Proceedings of the Royal Irish Academy'' a memoir "On the Imaginary Roots of Numerical Equations". Young died at Peckham on 5 March 1885. He was married and had at least two sons and four daughters.〔 E. I. Carlyle, rev. Alan Yoshioka, ("Young, John Radford (1799–1885)" ), Oxford Dictionary of National Biography, Oxford University Press, 2004. (Accessed 15 March 2014)〕 ==Works== * ''An Elementary Treatise on Algebra'' 1823, 1832, 1834 * ''Elements of Geometry'' 1827 * ''Elements of Analytical Geometry'' 1830 * ''An Elementary Essay on the Computation of Logarithms'' 1830 * ''The Elements of the Differential Calculus'' 1831 * ''The Elements of the Integral Calculus'' 1831 * ''The Elements of Mechanics, comprehending Statics and Dynamics'' 1832 * ''Elements of Plane and Spherical Trigonometry'' 1833 * ''On the Theory and Solution of Algebraical Equations'' 1835, 1843 * ''Mathematical Dissertations for the Use of Students'' in the Modern Analysis 1841 * ''On the General Principles of Analysis'', Part I.: The Analysis of Numerical Equations 1850 * ''An Introductory Treatise on Mensuration'' 1850 * ''An Introduction to Algebra and to the Solution of Numerical Equations'' 1851 * ''Rudimentary Treatise on Arithmetic'' 1858, 1882 * ''A Compendious Course of Mathematics'' 1855 * ''The Theory and Practice of Navigation and Nautical Astronomy'' 1856, 1882 * ''The Mosaic Cosmogony not “adverse to Modern Science'' 1861 * ''Science elucidative of Scripture and not antagonistic to it'' 1863 * ''Modern Scepticism viewed in relation to Modern Science'' 1865 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「John Radford Young」の詳細全文を読む スポンサード リンク
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