- Ronald Jensen
Infobox_Scientist
name = Ronald Jensen
image_width = 200px
caption = Prof. Ronald Jensen giving a lecture during "The First European Set Theory Meeting", Będlewo (Poland ), July 2007
birth_date = Birth date and age|1936|4|1
birth_place =
residence =Berlin ,Germany
nationality = USA
ethnicity =
field =Mathematician
work_institution =Humboldt University of Berlin
alma_mater =University of Bonn
doctoral_advisor = Gisbert Hasenjaeger
doctoral_students = Stephen Abraham, Oliver Deiser, Gunter Fuchs, Peter Koepke, Michael Lakis, Benedikt Loewe, Adrian Mathias, Charles Morgan, Ralf-Dieter Schindler, Max Schröder, Lee Stanley, Martin Zeman
known_for = Set theory,Mathematical logic
prizes =
footnotes =Ronald Björn Jensen (born April 1, 1936) is an American mathematician active in Europe, primarily known for his work in
mathematical logic andset theory .Career
Jensen completed the BA in
economics atAmerican University in 1959, and a Ph.D. inmathematics at theUniversity of Bonn in 1964. His supervisor wasGisbert Hasenjäger . Jensen taught atRockefeller University , 1969-71, and theUniversity of California, Berkeley , 1971-73. The balance of his academic career was spent in Europe at theUniversity of Bonn , theUniversity of Oslo , the University of Freiburg, theUniversity of Oxford , and theHumboldt-Universität zu Berlin , from which he retired in 2001. He now resides inBerlin .Results
Jensen's better-known results include the:
*Axiomatic set theory NFU, a proper extension ofNew Foundations , and the proof of NFU'sconsistency relative toPeano arithmetic ;
* Fine structure theory of theconstructible universe L. This work led to his being awarded in 2003 the Leroy P. Steele Prize for Seminal Contribution to Research of theAmerican Mathematical Society for his 1972 paper titled "The fine structure of the constructible hierarchy";
*Definitions and proofs of variouscombinatorial principle s in L, including diamond , square, and morass;
* JensenCovering Lemma for L;
* General theory ofcore model s and the construction of theDodd-Jensen core model ;
* Technique ofcoding the universe in a real .External links
*Jensen's [http://www.mathematik.hu-berlin.de/research/FB2000/node3.html page] at the
Humboldt-Universität zu Berlin .
* [http://kgs.logic.at/index.php?id=42 Brief biographies] of past presidents of theKurt Gödel Society .
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