Eliezer 'Leon' Ehrenpreis (May 22, 1930 – August 16, 2010,

Brooklyn Brooklyn () is a borough of New York City, coextensive with Kings County, in the U.S. state of New York. Kings County is the most populous county in the State of New York, and the second-most densely populated county in the United States, be ...

) was a

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

Temple University Temple University (Temple or TU) is a public state-related research university in Philadelphia, Pennsylvania. It was founded in 1884 by the Baptist minister Russell Conwell and his congregation Grace Baptist Church of Philadelphia then called Ba ...

who proved the

Malgrange–Ehrenpreis theorem In mathematics, the Malgrange–Ehrenpreis theorem states that every non-zero linear differential operator with constant coefficients has a Green's function. It was first proved independently by and . This means that the differential equation :P ...

, the fundamental theorem about

differential operator In mathematics, a differential operator is an operator defined as a function of the differentiation operator. It is helpful, as a matter of notation first, to consider differentiation as an abstract operation that accepts a function and return ...

s with constant coefficients. He previously held tenured positions at

Yeshiva University Yeshiva University is a private Orthodox Jewish university with four campuses in New York City."About YU
on the Yeshiva Universit ...

and at the

Courant Institute The Courant Institute of Mathematical Sciences (commonly known as Courant or CIMS) is the mathematics research school of New York University (NYU), and is among the most prestigious mathematics schools and mathematical sciences research cente ...

New York University New York University (NYU) is a private research university in New York City. Chartered in 1831 by the New York State Legislature, NYU was founded by a group of New Yorkers led by then-Secretary of the Treasury Albert Gallatin. In 1832, the ...

Early life and education

Leon was born in

New York City New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...

to a family of

Jewish Jews ( he, יְהוּדִים, , ) or Jewish people are an ethnoreligious group and nation originating from the Israelites Israelite origins and kingdom: "The first act in the long drama of Jewish history is the age of the Israelites""The ...

immigrants from

Eastern Europe Eastern Europe is a subregion of the Europe, European continent. As a largely ambiguous term, it has a wide range of geopolitical, geographical, ethnic, cultural, and socio-economic connotations. The vast majority of the region is covered by Russ ...

. He graduated from

Stuyvesant High School Stuyvesant High School (pronounced ), commonly referred to among its students as Stuy (pronounced ), is a State school, public university-preparatory school, college-preparatory, Specialized high schools in New York City, specialized high school ...

and studied Mathematics as an undergraduate at

City College of New York The City College of the City University of New York (also known as the City College of New York, or simply City College or CCNY) is a public university within the City University of New York (CUNY) system in New York City. Founded in 1847, Cit ...

. Afterward, he enrolled as a doctoral student at

Columbia University Columbia University (also known as Columbia, and officially as Columbia University in the City of New York) is a private research university in New York City. Established in 1754 as King's College on the grounds of Trinity Church in Manhatt ...

where he studied under mathematician

Claude Chevalley Claude Chevalley (; 11 February 1909 – 28 June 1984) was a French mathematician who made important contributions to number theory, algebraic geometry, class field theory, finite group theory and the theory of algebraic groups. He was a foundin ...

, obtaining his PhD in

1953 Events January * January 6 – The Asian Socialist Conference opens in Rangoon, Burma. * January 12 – Estonian émigrés found a Estonian government-in-exile, government-in-exile in Oslo. * January 14 ** Marshal Josip Broz Tito i ...

at the age of 23. His

doctoral thesis A thesis ( : theses), or dissertation (abbreviated diss.), is a document submitted in support of candidature for an academic degree or professional qualification presenting the author's research and findings.International Standard ISO 7144: ...

was entitled "Theory of Distributions in Locally Compact Spaces".

Religion

Ehrenpreis was also a

Rabbi A rabbi () is a spiritual leader or religious teacher in Judaism. One becomes a rabbi by being ordained by another rabbi – known as ''semikha'' – following a course of study of Jewish history and texts such as the Talmud. The basic form of ...

, having received his ordination from the renowned

Rabbi Moshe Feinstein Moshe Feinstein ( he, משה פײַנשטיין; Lithuanian pronunciation: ''Moshe Faynshteyn''; en, Moses Feinstein; March 3, 1895 – March 23, 1986) was an American Orthodox rabbi, scholar, and ''posek'' (authority on ''halakha''—J ...

. He was the author of a work on the

Chumash Chumash may refer to: *Chumash (Judaism), a Hebrew word for the Pentateuch, used in Judaism *Chumash people, a Native American people of southern California *Chumashan languages, indigenous languages of California See also * Chumash traditional ...

and other religious topics, currently in manuscript.

Miscellaneous

Ehrenpreis ran the

New York City Marathon The New York City Marathon (currently branded TCS New York City Marathon after its headline sponsor) is an annual marathon () that courses through the five boroughs of New York City. It is the largest marathon in the world, with 53,627 finishe ...

every year from its inception until 2007.

Publications

* * * * * * * * * * * * * * *

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)

External links

* {{DEFAULTSORT:Ehrenpreis, Leon 2010 deaths 1930 births 20th-century American mathematicians 21st-century American mathematicians Jewish scientists Temple University faculty People from Brooklyn Mathematicians from New York (state) Columbia University alumni Stuyvesant High School alumni