Joseph Ritt

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Joseph Ritt
Born (1893-08-23)August 23, 1893
New York City, USA
Died January 5, 1951(1951-01-05) (aged 57)
New York City, USA
Nationality American
Fields Mathematics
Institutions Columbia University
Alma mater Columbia University
Doctoral advisor Edward Kasner
Doctoral students Richard Cohn
Irving Gerst
Ellis Kolchin
Howard Levi
Edgar Lorch
Known for Ritt theorem

Joseph Fels Ritt (August 23, 1893 – January 5, 1951) was an American mathematician at Columbia University in the early 20th century. He was born and died in New York.

After beginning his undergraduate studies at City College of New York, Ritt received his B.A. from George Washington University in 1913. He then earned a doctorate in mathematics from Columbia University in 1917 under the supervision of Edward Kasner. After doing calculations for the war effort in World War I, he joined the Columbia faculty in 1921. He served as department chair from 1942 to 1945, and in 1945 became the Davies Professor of Mathematics.[1][2] In 1932, George Washington University honored him with a Doctorate in Science,[3] and in 1933 he was elected to join the United States National Academy of Sciences.[1][2] He has 463 academic descendants listed in the Mathematics Genealogy Project, mostly through his student Ellis Kolchin.[4]

He is known for his work on characterizing the indefinite integrals that can be solved in closed form, for his work on the theory of ordinary differential equations and partial differential equations, for beginning the study of differential algebraic groups,[1][2] and for the method of characteristic sets used in the solution of systems of polynomial equations.

Selected works[edit]

  • Differential equations from the algebraic standpoint, New York, American Mathematical Society 1932
  • Theory of Functions, New York 1945, 1947
  • Integration in finite terms: Liouville´s Theory of Elementary Methods, Columbia University Press 1948
  • Differential Algebra, American Mathematical Society 1950, Dover 1966

See also[edit]