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| {{Infobox scientist
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| | name = Ronald Jensen
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| | image = RJensen.jpg
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| | image_size = 200px
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| | caption = Prof. Ronald Jensen giving a lecture during ''The First European Set Theory Meeting'', Będlewo ([[Poland]]), July 2007
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| | birth_date = {{Birth date and age|1936|4|1}}
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| | birth_place =
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| | residence = [[Berlin]], [[Germany]]
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| | nationality = [[United States]]
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| | ethnicity =
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| | field = [[Mathematician]]
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| | work_institution = [[Humboldt University of Berlin]]
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| | alma_mater = [[University of Bonn]]
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| | doctoral_advisor = Gisbert Hasenjaeger
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| | doctoral_students = Stephen Abraham, Oliver Deiser, Gunter Fuchs, Peter Koepke, Michael Lakis, [[Benedikt Löwe|Benedikt Loewe]], Adrian Mathias, Charles Morgan, Ralf-Dieter Schindler, Max Schröder, Lee Stanley, Martin Zeman
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| | known_for = [[Axiomatic Set Theory|Set theory]], [[mathematical logic]]
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| | prizes =
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| | footnotes =
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| }}
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| '''Ronald Björn Jensen''' (born April 1, 1936) is an [[United States|American]] [[mathematician]] active in [[Europe]], primarily known for his work in [[mathematical logic]] and [[set theory]].
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| ==Career==
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| Jensen completed the BA in [[economics]] at [[American University]] in 1959, and a Ph.D. in [[mathematics]] at the [[University of Bonn]] in 1964. His supervisor was [[:de:Gisbert Hasenjaeger|Gisbert Hasenjaeger]]. Jensen taught at [[Rockefeller University]], 1969–71, and the [[University of California, Berkeley]], 1971-73. The balance of his academic career was spent in Europe at the
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| [[University of Bonn]], the [[University of Oslo]], the [[Albert Ludwigs University of Freiburg|University of Freiburg]], the [[University of Oxford]], and the [[Humboldt-Universität zu Berlin]], from which he retired in 2001. He now resides in [[Berlin]].
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| ==Results==
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| Jensen's better-known results include the:
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| * [[Axiomatic set theory]] [[New Foundations|NFU]], a variant of [[New Foundations]] (NF) where extensionality is weakened to allow several sets with no elements, and the proof of NFU's [[consistency]] relative to [[Peano arithmetic]];
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| * Fine structure theory of the [[constructible universe]] '''L'''. This work led to his being awarded in 2003 the [[Leroy P Steele Prize|Leroy P. Steele Prize for Seminal Contribution to Research]] of the [[American Mathematical Society]] for his 1972 paper titled "The fine structure of the constructible hierarchy";
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| *Definitions and proofs of various [[Infinitary combinatorics|infinitary combinatorial principle]]s in '''L''', including [[diamondsuit|diamond]] <math>\diamondsuit</math>, [[global square|square]], and [[morass (set theory)|morass]];
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| * Jensen [[Covering Lemma]] for '''L''';
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| * General theory of [[core model]]s and the construction of the [[Dodd–Jensen core model]];
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| * Technique of [[coding the universe by a real]].
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| ==External links==
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| *Jensen's [http://www-irm.mathematik.hu-berlin.de/~raesch/org/jensen.html page] at the [[Humboldt-Universität zu Berlin]].
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| *[http://kgs.logic.at/index.php?id=42 Brief biographies] of past presidents of the [[Kurt Gödel Society]].
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| {{Persondata
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| | NAME = Jensen, Ronald
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| | ALTERNATIVE NAMES =
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| | SHORT DESCRIPTION = American logician
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| | DATE OF BIRTH = April 1, 1936
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| | PLACE OF BIRTH =
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| | DATE OF DEATH =
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| | PLACE OF DEATH =
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| }}
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| {{DEFAULTSORT:Jensen, Ronald}}
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| [[Category:1936 births]]
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| [[Category:Living people]]
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| [[Category:American logicians]]
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| [[Category:20th-century mathematicians]]
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| [[Category:21st-century mathematicians]]
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| [[Category:American University alumni]]
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| [[Category:Set theorists]]
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| [[Category:University of Bonn alumni]]
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