Joseph P. LaSalle

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Joseph Pierre LaSalle (born May 28, 1916 in State College , Pennsylvania , † July 7, 1983 in Little Compton , Rhode Island ) was an American mathematician who dealt with differential equations , their stability theory and optimal control theory .

His father was a professor at Pennsylvania State College and later at Louisiana State University . LaSalle first studied political science there and prepared for a law degree. A logic lecture, which his law professor recommended as preparation, aroused his interest in mathematics. After graduating with a bachelor's degree in 1937, he studied mathematics at Caltech , where he became Henry Laws Fellow in 1939 and received his doctorate in 1941 under Aristotle Demetrius Michal ( pseudo-normed linear sets over valued rings ). In 1942 he was an instructor in applied mathematics at the University of Texas and in 1943 an instructor in the Radar School of the Massachusetts Institute of Technology . In 1944 he was in Princeton a member of a mathematics group that advised the United States Army Ordnance Corps Arms Procurement Office and from 1944 to 1946 he worked with physicists from Cornell University on the construction of a radar system ( magnetron ) for the US Navy. In 1946 he became an assistant professor and in 1956 a professor at the University of Notre Dame . As a visiting scientist at Princeton in 1947/48 with Solomon Lefschetz , he began to deal with differential equations and became friends with Richard Bellman . In 1958 he joined Lefschetz's research group on differential equations at the Research Institute for Advanced Studies (RIAS) in Baltimore , and they began working on Lyapunov's direct method in the stability theory of differential equations. In 1964 he went with Lefschetz to Brown University at the newly founded Lefschetz Center for Dynamical Systems, of which LaSalle was director from 1964 to 1980. From 1968 to 1973 he headed the Faculty of Applied Mathematics there.

1962/63 he was President of SIAM and from 1964 to 1967 in its Board of Trustees.

In 1964 he founded the Journal of Differential Equations and was its editor until 1980. He was also the editor of the Journal of Mathematical Analysis and Applications and the Applied Mathematical Science series published by Springer. In 1965 he received the Chauvenet Prize with Jack K. Hale .


  • with Solomon Lefschetz: Stability by Liapunov's direct method, with applications , Academic Press 1961
    • German edition: The stability theory of Lyapunoff - the direct method and its applications , BI University Pocket Book 1967
  • with Henry Hermes: Functional Analysis and Optimal Control , Academic Press 1969
  • Stability and Control of Discrete Processes , Springer Verlag 1986
  • The stability of dynamical systems , SIAM 1976 (with appendix by Z. Artstein)

Web links

Individual evidence

  1. ^ Mathematics Genealogy Project