Leon Ehrenpreis Explained

Eliezer 'Leon' Ehrenpreis (May 22, 1930 – August 16, 2010, Brooklyn) was a mathematician at Temple University who proved the Malgrange–Ehrenpreis theorem, the fundamental theorem about differential operators with constant coefficients. He previously held tenured positions at Yeshiva University and at the Courant Institute at New York University.

Early life and education

Leon was born in New York City to a family of Jewish immigrants from Eastern Europe. He graduated from Stuyvesant High School and studied Mathematics as an undergraduate at City College of New York. Afterward, he enrolled as a doctoral student at Columbia University where he studied under mathematician Claude Chevalley, obtaining his PhD in 1953 at the age of 23. His doctoral thesis was entitled "Theory of Distributions in Locally Compact Spaces".^[1]

Religion

Ehrenpreis was also a Rabbi, having received his ordination from the renowned Rabbi Moshe Feinstein.^[2] He was the author of a work on the Chumash and other religious topics, currently in manuscript.

Miscellaneous

Ehrenpreis ran the New York City Marathon every year from its inception until 2007.

Publications

- - Uniformly Bounded Representations of Groups. Leon. Ehrenpreis. F. I.. Mautner. Friederich Ignaz Mautner. Proc Natl Acad Sci U S A. 15 April 1955. 41. 4. 231–233. 528064. 16589653. 10.1073/pnas.41.4.231. 1955PNAS...41..231E. free.
The Division Problem for Distributions. Leon. Ehrenpreis. Proc Natl Acad Sci U S A. 15 October 1955. 41. 10. 756–758. 528179. 10.1073/pnas.41.10.756. 16589744. 1955PNAS...41..756E. free.
Completely Inversible Operators. Leon. Ehrenpreis. 2. Proc Natl Acad Sci U S A. 15 November 1955. 41. 11. 945–946. 534310. 10.1073/pnas.41.11.945. 16589777. 1955PNAS...41..945E. free.
General Theory of Elliptic Equations. Leon. Ehrenpreis. 2. Proc Natl Acad Sci U S A. January 1956. 42. 1. 39–41. 534228. 16589811. 10.1073/pnas.42.1.39. 1956PNAS...42...39E. free.
Cauchy's Problem for Linear Differential Equations with Constant Coefficients. Leon. Ehrenpreis. 2. Proc Natl Acad Sci U S A. September 1956. 42. 9. 642–646. 534268. 10.1073/pnas.42.9.642. 16589923. 1956PNAS...42..642E. free.
Sheaves and differential equations. Leon. Ehrenpreis. 2. Proc. Amer. Math. Soc.. 1956. 7. 1131–1138. 0085419. 10.1090/s0002-9939-1956-0085419-7. free.
On the theory of kernels of Schwartz. Leon. Ehrenpreis. 2. Proc. Amer. Math. Soc.. 1956. 7. 4. 713–718. 0082637. 10.1090/s0002-9939-1956-0082637-9. free.
Analytic functions and the Fourier transform of distributions, II. Leon. Ehrenpreis. 2. Trans. Amer. Math. Soc.. 1958. 89. 2. 450–483. 0105616. 10.1090/s0002-9947-1958-0105616-8. free.
Analytically uniform spaces and some applications. Leon. Ehrenpreis. 2. Trans. Amer. Math. Soc.. 1961. 101. 52–74. 0131756. 10.1090/s0002-9947-1961-0131756-3. free.
A new proof and an extension of Hartog's theorem. Leon. Ehrenpreis. 2. Bull. Amer. Math. Soc.. 1961. 67. 5. 507–509. 0131663. 10.1090/s0002-9904-1961-10661-7. free.
Holomorphic convexity of Teichmüller spaces. Lipman. Bers. Lipman Bers. Leon. Ehrenpreis. Bull. Amer. Math. Soc.. 1964. 70. 6. 761–764. 0168800. 10.1090/s0002-9904-1964-11230-1. free.
Hyperbolic equations and group representations. Leon. Ehrenpreis. Bull. Amer. Math. Soc.. 1975. 81. 6. 1109–111. 0419685. 10.1090/s0002-9904-1975-13936-x. free.
Reflections, removable singularities, and approximations for partial differential equations, II. Leon. Ehrenpreis. 2. Trans. Amer. Math. Soc.. 1987. 302. 1–45. 887494. 10.1090/s0002-9947-1987-0887494-0. free.

References

- - "One thing you can count on is this math prof on the run", Temple Times, November 7, 2002 Volume 33 Number 10 (retrieved August 17, 2010)

Notes and References

Remembering Leon Ehrenpreis. Struppa. Danielle C.. May 2011. Notices of the AMS. 58 . 5.
News: Eliezer 'Leon' Ehrenpreis, 80, rabbi, Temple mathematician. Naedele. Walter F.. September 5, 2010. The Philadelphia Inquirer.