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Ronald Martin Foster (3 October 1896 – 2 February 1998), was a Bell Labs mathematician whose work was of significance regarding electronic filters for use on telephone lines. He published an important paper, A Reactance Theorem,[1] (see Foster's reactance theorem) which quickly inspired Wilhelm Cauer to begin his program of network synthesis filters which put the design of filters on a firm mathematical footing.[2] He is also known for the Foster census of cubic symmetric graphs[3] and the 90-vertex cubic symmetric Foster graph. Contents 1 Education 2 Family 3 Professional career 4 Publications 5 References // Education Foster was a Harvard College graduate S.B. (Mathematics), summa cum laude, Class of 1917. He also received two honorary Sc.D.s. [3] Family He married Annabel Conover,12 April 1924 and had four children: Ronald Martin Foster, Jr.(1926 - 2006), Hubert Conover Foster (1928 - ), Theodore Dean Foster (1929 - ), Alan Stuart Foster (1933 - ). Professional career 1917 – 1943 Research & Development Department (later Bell Labs), American Telephone & Telegraph, as a Research Engineer (Applied Mathematician), New York City, New York. 1943 – 1963 Professor and Head of Department of Mathematics, Polytechnic Institute of Brooklyn, Brooklyn, New York City, New York. Publications Campbell, GA, Foster, RM, Fourier Integrals for Practical Applications, "Bell Systems Technical Journal", pp639-707, 1928. Pierce, BO, Foster. RM. "A Short Table of Integrals", Fourth Edition, Ginn and Company, pp1-189, 1956. References ^ Foster, R M, "A reactance theorem", Bell Systems Technical Journal, Vol. 3, pp259–267, 1924. ^ E. Cauer, W. Mathis, and R. Pauli, "Life and Work of Wilhelm Cauer (1900 – 1945)", Proceedings of the Fourteenth International Symposium of Mathematical Theory of Networks and Systems (MTNS2000), Perpignan, June, 2000. Retrieved online 19th September 2008. ^ a b "The Foster Census: R.M. Foster's Census of Connected Symmetric Trivalent Graphs", by Ronald M. Foster, I.Z. Bouwer, W.W. Chernoff, B. Monson and Z. Star (1988) ISBN 0919611192.