Clarence I. Lubin

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Clarence Isador Lubin (born October 15, 1900 in Albany , Georgia , † November 25, 1989 ) was an American mathematician .

Life

He grew up in Cincinnati , in the state of Ohio , and attended the Hughes High School. He then matriculated to study chemical engineering at the University of Cincinnati . There he played college football and was a member of the Sigma Alpha Mu fraternity .

He was able to complete his studies in 1923 and subsequently worked as a teacher at the University's College of Engineering until his retirement in 1971. In 1925 he became a member of the Mathematical Association of America and for the 1927–28 term he served as President of the Mathematical Club of Harvard University . In June 1929 he was at Harvard University with a dissertation on singular points of second-order system of real differential equations for Ph.D. PhD in mathematics and was appointed Assistant Professor in Cincinnati that same year. When his friend and former fellow student Charles V. Theis (1900–1987) - a well-known hydrogeologist in later years - developed a basic formula for sinking funnels analogous to heat flow (Theis' well equation, Theis equation), he recognized Lubin's support , since both had been in fruitful scientific correspondence beforehand . Lubin was promoted to associate professor in October 1937. In the summer of 1943, he got a job with the New York City- based Kellex Corporation, a subsidiary of the MW Kellogg Company, which was involved in the Manhattan Project . Together with other mathematicians, he was involved in the planning of a uranium enrichment plant at Oak Ridge National Laboratory .

Lubin remained unmarried until the age of 54. His hobbies included hiking and camping in Canada .

Publications (selection)

Essays

  • Lubin, CI: Transformation of differential equations in the neighborhood of singular points . In: Duke Mathematical Journal , Vol. 3, № 3, 1937, pages 394-417.
  • Lubin, CI: The Theorem of Lehmus and Complex Numbers . In: Scripta Mathematical , Vol. 24, June 1959, pages 137-140.
  • Lubin, CI / Mazkewitsch, D .: Trammel Method Construction of the Ellipse . In: The Mathematics Teacher , Vol. 54, № 8, 1961, pages 609-612.
  • Lubin, CI / Macintyre, AJ : On e and its approximation . In: Mathematics Magazine , Vol. 43, № 2, March 1970, pages 98-101.
  • Lubin, CI / Cohen, EA : An inequality of Theodore Chaundy’s . In: Journal of Mathematical Analysis and Applications , Vol. 40, № 3, 1972, pages 594-600.

Problems, solutions, discussions and suggestions

  • Lubin, CI: An integral . In: The American Mathematical Monthly , Vol. 53, № 10, December 1946, page 586 - Discussions and notes.
  • Lubin, CI: Differentiation of the Trigonometric Functions . In: The American Mathematical Monthly , Vol. 54, № 8, October 1947, pages 465-468 - Classroom notes.
  • Lubin, CI: Vector Triple Product . In: The American Mathematical Monthly , Vol. 61, № 1, January 1954, pages 42-43 - Classroom notes.
  • Lubin, CI: Problem E 1106 / The intersection of two secants . In: The American Mathematical Monthly , Vol. 61, № 3, March 1954, page 194 - Elementary problems and solutions.
  • Lubin, CI: 2506 / Note on a theorem from "Reciprocal Nomograms", by CV Gregg . In: The Mathematical Gazette , Vol. 39, № 328, May 1955, pages 133-134 - Mathematical Notes.
  • Lubin, CI / Macintyre, AJ : Problem 5445 / Continued fraction for e k . In: The American Mathematical Monthly , Vol. 73, № 10, December 1966, p. 1124 - Advanced problems.

Individual evidence

  1. ↑ Clarence I. Lubin in the US Social Security Death Register (SSDI), accessed October 3, 2018
  2. ↑ The American Mathematical Monthly , Vol. 32, № 2, February 1925, p. 57.
  3. ^ The American Mathematical Monthly , Vol. 35, № 3, March 1928, p. 154.
  4. ↑ The American Mathematical Monthly , Vol. 37, № 6, June / July 1930, p. 328.
  5. ↑ The American Mathematical Monthly , Vol. 36, № 7, August / September 1929, page 407.
  6. ↑ The American Mathematical Monthly , Vol. 44, № 8, October 1937, p. 549.
  7. ^ The American Mathematical Monthly , Vol. 50, № 7, August / September 1943, p. 462.
personal data
SURNAME Lubin, Clarence I.
ALTERNATIVE NAMES Lubin, Clarence Isador (full name)
BRIEF DESCRIPTION American mathematician
DATE OF BIRTH October 15, 1900
PLACE OF BIRTH Albany , Georgia
DATE OF DEATH November 25, 1989