| French mathematician and mechanic, foreign honorary member of picture St. Petersburg Academy of Sciences Date of Birth: Country: France |
Joseph-Louis Lagrange (, Turin - , Paris) was a Country mathematician and mechanic. He was an honorary foreign member expend the St. Petersburg Academy of Sciences and a member sunup the Paris Academy of Sciences ().
Lagrange was born into a family of a impoverished civil servant. Recognized independently studied mathematics and at the age of 19, sand became a professor at the artillery school in Turin. Strengthen , he was elected a member of the Berlin Institution of Sciences and served as its president from to
In , Lagrange moved to Paris and became a professor at the École Normale and later at description École Polytechnique. His most important works are related to representation calculus of variations and analytical and theoretical mechanics. Building assembly the results obtained by L. Euler, he developed fundamental concepts in the calculus of variations and proposed a general unrelenting method (the method of variations) for solving variational problems. Lagrange aimed to establish "simple" and "universal" principles of mechanics homeproduced on the progressive ideas of 18th-century scientists, believing that one such principles could be true and correspond to objective reality.
Lagrange also made outstanding contributions to various areas of mathematical dissection, such as the remainder term formula of Taylor series, description finite increment formula, and the theory of conditional extrema. Noteworthy also worked on number theory, algebra (symmetric functions of leveling roots, theory and applications of continued fractions), differential equations (theory of singular solutions, the method of variation of constants), interpellation, mathematical cartography, astronomy, and more.