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**Sydney Luxton Loney**, M.A. (16 March 1860 – 16 May 1939) was a Professor of Mathematics at the Royal Holloway College, Egham, Surrey, and a fellow of Sidney Sussex College, Cambridge, England.^{[1]} He authored a number of mathematics texts, some of which have been reprinted numerous times. He is known as an early influence on Srinivasa Ramanujan.^{[2]}

S. L. Loney | |
---|---|

Born | Chevithorne, Devon, England | March 16, 1860

Died | May 16, 1939 | (aged 79)

Alma mater | Sidney Sussex College, Cambridge |

Occupation | Professor, author |

Organization | Royal Holloway College |

Loney was educated at Maidstone Grammar School, in Tonbridge and at Sidney Sussex College, Cambridge, where he graduated with a B.A. as 3rd Wrangler in 1882.^{[3]} His books on Plane Trigonometry and Coordinate Geometry are very popular among senior high school students in India who are preparing for engineering entrance exams like JEE Advanced.^{[4]}

- Loney, SL (1889),
*A treatise on elementary dynamics*, Cambridge: University Press, JFM 21.0845.01 - Loney, SL (1893), "Mechanics and hydrostatics for beginners",
*Nature*, Cambridge: University Press,**47**(1219): 437, Bibcode:1893Natur..47..437G, doi:10.1038/047437b0, JFM 25.1331.02, S2CID 3983398 - Loney, SL (1895),
*The elements of coordinate geometry*, London: Macmillan and Co., JFM 26.0640.01 - Loney, SL (1897),
*The elements of statics and dynamics*, Cambridge: University Press, JFM 23.0903.08 - Loney, SL (1903),
*A Shilling Arithmetic*, London: Macmillan and Co. - Loney, SL (1909),
*An elementary treatise on the dynamics of a particle and of rigid bodies*, Cambridge: University Press, JFM 21.0845.02 - Loney, SL (1912),
*An elementary treatise on statics*, Cambridge: University Press, JFM 43.0799.06 - Loney, SL (1912),
*Plane Trigonometry*, Cambridge: University Press, JFM 25.0892.12

**^**"List of Members of The London Mathematical Society" (PDF),*Proceedings of the London Mathematical Society*, vol. 35, 13 November 1902**^**Berndt, Bruce C.; Rankin, Robert A. (2000). "The books studied by Ramanujan in India".*The American Mathematical Monthly*.**107**(7): 595–601. doi:10.1080/00029890.2000.12005244. JSTOR 2589114. S2CID 218544331.**^**"Loney, Sidney Luxton (LNY878SL)".*A Cambridge Alumni Database*. University of Cambridge.**^**"Trigonometry for JEE Main and Advanced".*www.acadboost.com*. Retrieved 30 March 2022.

*Plane Trigonometry*, 1st Edition (1893) at the Internet Archive*Plane Trigonometry*, 2nd Edition (1895) at the Internet Archive