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Nikolay Yakovlevich Sonin

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22 Feb 1849

Tula, Russia

27 Feb 1915

Petrograd (now St Petersburg), Russia

Nikolay Sonin attended Moscow University studying mathematics and physics there from 1865 to 1869. He obtained a Master's Degree with a thesis submitted in 1871, then he taught at the University of Warsaw where he obtained a doctorate in 1874. He was appointed to a chair in the University of Warsaw in 1876. In 1894 Sonin moved to St Petersburg where he taught at the University for Women.

Sonin worked on special functions , in particular cylindrical functions. He also worked on the Euler - Maclaurin summation formula.

Other topics Sonin studied included Bernoulli polynomials ( Jacob Bernoulli ) and approximate computation of definite integrals, continuing Chebyshev 's work on numerical integration.

Together with A A Markov , Sonin prepared a two volume edition of Chebyshev 's works in French and Russian.

Source:School of Mathematics and Statistics University of St Andrews, Scotland