Matematicieni

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Mikhail Vasilevich Ostrogradski

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24 Sept 1801

Pashennaya (now Poltava oblast), Ukraine

1 Jan 1862

Poltava (now Ukraine)

Prezentare
Mikhail Ostrogradski attended the Poltava Gymnasium secondary school. When the time came for him to leave, he expressed a wish to have a military career. However his family was not wealthy and it was felt that a soldier's pay was not good enough. Eventually it was decided that he should take up a career in the civil service and in order to obtain a high ranking position a university education was necessary.

Ostrogradski entered the University of Kharkov in 1816 and studied physics and mathematics. In 1820 he took and passed the exams necessary for his degree but the minister of religious affairs and national education refused to confirm the decision and required him to retake the examinations.

The problem appears to have been his mathematics teacher Osipovsky who, in the year 1820, was suspended from his post on religious grounds. The officials who made this decision made Osipovsky 's pupil suffer too. Officially the reason given was that Ostrogradski had not attended lectures on philosophy and theology. Ostrogradski refused to retake the examinations and never received his degree.

He left Russia to study in Paris. Here between 1822 and 1827 he attended lectures by Laplace , Fourier , Legendre , Poisson , Binet and Cauchy . He made rapid progress in Paris and soon began to publish papers in the Paris Academy .

His papers at this time show the influence of the mathematicians in Paris and he wrote on physics and the integral calculus. These papers were later incorporated in a major work on hydrodynamics with he published in Paris in 1832. Other results which he obtained at this time on residue theory appeared in Cauchy 's works.

Ostrogradski went to St Petersburg in 1828. He presented three important papers on the theory of heat, double integrals and potential theory to the Russian Academy of Sciences . Largely on the strength of these papers he was elected an academician in the applied mathematics section. He made important contributions to partial differential equations , elasticity and to algebra publishing over 80 reports and giving lectures. His work on algebra was an extension of Abel's work on algebraic functions and their integrals.

From 1828 Ostrogradski lectured at the Naval Academy, also from 1830 he lectured at the Institute of Communication and, from 1832, also at the Pedagogical Institute.

Ostrogradski aimed high in his research and his object was to provide a combined theory of hydrodynamics, elasticity, heat and electricity. Of course this was far beyond what could be achieved but, by aiming at a grand scheme, he made major developments in a wide range of areas.

In 1840 he wrote on ballistics introducing the topic to Russia. His important work on ordinary differential equations considered methods of solution of non-linear equations which involved power series expansions in a parameter alpha. Liouville had produced similar results. Similarly some of his results on heat were similar to results produced by Lamé and by Duhamel .

From 1847 he was chief inspector for the teaching of mathematical sciences in military schools. He wrote many fine textbooks and established the conditions which allowed Chebyshev 's school to flourish in St Petersburg. He should also be considered as the founder of the Russian school of theoretical mechanics.

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