Place of birth: Courland
David (Aug Yul`evich) - Professor of Mathematics at Moscow University, the brother of cellist David Charles (1823 - 1885); Kurland was born in a Jewish family in 1841, he entered the Moscow University and graduated from the course in 1845 with a gold medal for his essay "On beskonechnomalyh movements." After university course David continued his studies in mathematics under the supervision of Professor ND Brashman. In 1848, David received a Master of Mathematics degree (and vposledstii Wii Demidov Prize) for his work "The theory of equilibrium of bodies immersed in a liquid." In 1850, began as an adjunct, lectures on physics and mathematics department of Moscow University in probability theory. In 1851, David defended his doctoral thesis entitled: "The definition of the form of the liquid surface, contained in the vessel." In the same year appeared his "theory of capillary phenomena." In 1853, David was appointed extraordinary professor in the Department of Applied Mathematics - the title, in which he remained until 1859 During this period, he wrote: "The application of probability theory to statistics" and "application of probability theory to medicine", and on mechanics "Design and operation of steam engines", "The largest number of equilibrium positions floating triangular prism" and "theory of equilibrium of bodies immersed in a liquid." In 1859, David was appointed full professor in the Department of prikladnoymatematiki occupied by him, and in 1862 moved to the department of pure mathematics, and which held for him until the end of service at the university. It is also important sector of public life of David was his active participation in the direction of the teaching of mathematical sciences in secondary schools. It began with the adoption of them, in 1860, an inspector of the private schools of the capital, and the traces remained, and still, thanks to its numerous and popular textbooks. First published his "Elementary Geometry" - in 1863 and until 1889, she managed to withstand 13 publications. Then followed: "Elementary Algebra" (published in 1883, the 10th edition), "A Guide to Arithmetic", "Geometry for the county schools" and "Elementary trigonometry." - David was one of the founders of the Moscow Mathematical Society. Scientists have his works published during this time almost exclusively in the organ of society - "Mathematical Collection", "Partial differential equations differentials kakogo-nibud order" (Volume I), "On the geometric representation of the elementary functions of the first kind" (Volume II); "Elementary derivation of the formula: ..." (ibid.); "Note on Abelian functions" (Volume IV); "The spread of the binomial formula to fractional and negative values" (ibid.); "The unity of weights and measures" (speech, read in the 2nd General Meeting of the 2nd Congress of the Russian scientists, ibid.); "On a general formula in the theory of definite integrals" (Volume X). D. Grave.