- Stanislaw Ulam
Infobox Scientist

name = Stanislaw Ulam

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caption = Stanisław Ulam in the 1950s

birth_date = birth date|1909|4|13

birth_place =Lwów

death_date = death date and age|1984|5|13|1909|4|13

death_place = Santa Fe

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nationality = Polish

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field =mathematician

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known_for =nuclear pulse propulsion

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**Stanisław Marcin Ulam**(April 13 ,1909 –May 13 ,1984 ) was a Polishmathematician who participated in theManhattan Project and proposed theTeller–Ulam design ofthermonuclear weapons . He also inventednuclear pulse propulsion and developed a number of mathematical tools innumber theory ,set theory ,ergodic theory , andalgebraic topology .**Biography**Stanislaw Ulam was born to a

Polish Jewish family inLwów (German: Lemberg; Ukrainian: Lviv), Galicia, then inAustria-Hungary ; since 1918 inPoland and since 1939 inUSSR . He was part of the city's large Jewish minority population; when he grew up in the city, it was in theSecond Polish Republic . His mentor in mathematics wasStefan Banach , a great Polish mathematician and one of the moving spirits of theLwów School of Mathematics and more broadly of the remarkableInterbellum Polish School of Mathematics .Ulam went to the

United States in 1938 as a Harvard Junior Fellow. He visited Poland in summer 1939 and together with his brother, Adam, escaped from Poland on the eve of the Second World War; the rest of their family died inThe Holocaust . When his fellowship was not renewed, he served on the faculty of theUniversity of Wisconsin-Madison . While in U.S., in the midst of the war, his friendJohn von Neumann invited him to a secret project inNew Mexico . Ulam researched the invitation by checking out a book on New Mexico from the university library. He found on the book's check-out card the names of all those who had successively disappeared from the campus at the UW. Ulam then joined theManhattan Project at Los Alamos.While there, he suggested the

Monte Carlo method for evaluating complicated mathematicalintegral s that arise in the theory of nuclearchain reaction s (not knowing that Fermi and others had used a similar method earlier). This suggestion led to the more systematic development of Monte Carlo by Von Neumann, Metropolis, and others.Ulam — in collaboration with

C.J. Everett , who did the detailed calculations — showedEdward Teller 's early model of thehydrogen bomb to be inadequate. Ulam then went on to suggest a better method. He was the first to realize that one could place all the H-bomb's components inside one casing, put afission bomb at one end and thermonuclear material at the other, and use mechanical shock from the fission bomb to compress and detonate fusionfuel . This idea was probably an outcome of Ulam's initial ideas for 'staging' a conventional fission device, in which the neutron flux from one fission bomb would compress the fuel in another one, thus increasing its efficiency.Teller at first resisted this idea, then saw its merit and suggested the use of a plutonium "spark plug", located at the center of the fusion fuel, to initiate and enhance the fusion reaction. Teller also modified Ulam's idea of compression by realizing that radiation from the fission bomb would compress the thermonuclear fuel much more efficiently than mechanical shock. This design, called staged radiation implosion, has since been the standard method of creating H-bombs. Although this approach was worked out independently by Soviet physicist

Andrei Sakharov , it is often referred to as the "Teller–Ulam design ". Ulam and Teller jointly applied for a patent on the hydrogen bomb.Ulam also invented

nuclear pulse propulsion and, at the end of his life, declared it the invention of which he was proudest.He was an early proponent of using computers to perform "mathematical experiments." His most notable contribution here may have been his part in the

Fermi–Pasta–Ulam experiment s, an early numerical study of a dynamical system.Another dynamical system he introduced is the well-known

Fermi–Ulam model (FUM), that is a variant of Fermi's primary work on acceleration ofcosmic rays , namelyFermi acceleration . FUM became over the years a prototype model for studying non-linear dynamics and coupled mappings.In pure mathematics, he worked in

set theory (includingmeasurable cardinal s and abstract measures),topology ,ergodic theory , and other fields. After World War II he largely turned from rigorous pure mathematics to speculative and imaginative work, posing problems and making conjectures (which had always been specialties of his) that often concerned the application of mathematics tophysics andbiology . His friendGian-Carlo Rota ascribed this change to an attack ofencephalitis in 1946 that Rota claimed changed Ulam's personality (though detail had never been Ulam's strong point). This suggestion is believed by many but rejected by Ulam's widow, Françoise, among others.In May 1958, while referring to a conversation with von Neumann, Ulam said what would later become a foundation of the

technological singularity theory:One conversation centered on the ever accelerating progress of technology and changes in the mode of human life, which gives the appearance of approaching some essential singularity in the history of the race beyond which human affairs, as we know them, could not continue.

Ulam took a position at the University of Colorado in 1965. As he remained a consultant at Los Alamos, he divided his time between Boulder,

Colorado , USA and Santa Fe,New Mexico , from which he commuted to Los Alamos. Later he and his wife spent winters in Gainesville,Florida , where he had a position with theUniversity of Florida . He died in Santa Fe onMay 13 ,1984 .**Bethe on Ulam*** "After the H-bomb was made, reporters started to call Teller the father of the H-bomb. For the sake of history, I think it is more precise to say that

**Ulam**is the father, because he provided the seed, and Teller is the mother, because he remained with the child. As for me, I guess I am the midwife." (Hans Bethe , 1968, as quoted by Schweber, p.166.)**ee also**

*Borsuk-Ulam theorem

*Mazur–Ulam theorem

*Fermi–Ulam model

*Lucky number (1955)

*Ulam spiral (1963)

*Ulam conjecture (in Number Theory)

*Ulam's Conjecture (in Graph theory) aka theReconstruction conjecture

*Ulam's game

*Ulam numbers

*Scottish Café

*Adam Ulam , Stanislaw's brother, a notedKremlinologist atHarvard University **Books*** Stanisław Ulam, "The

Scottish Book : a Collection of Problems", Los Alamos, 1957.

* Stanisław Ulam, "A Collection of Mathematical Problems", New York, Interscience Publishers, 1960.

*Mark Kac and Stanisław Ulam, "Mathematics and Logic: Retrospect and Prospects", New York, Praeger, 1968. Dover paperback reprint edition ca. 1990.

* Stanisław Ulam, "Sets, Numbers and Universes", Cambridge, Massachusetts, 1974.

* Stanisław Ulam, "Adventures of a Mathematician", New York, Charles Scribner's Sons, 1983 (autobiography).

* Stanisław Ulam, "Analogies Between Analogies: The Mathematical Reports of S.M. Ulam and his Los Alamos Collaborators". Berkeley: University of California Press, 1990 [*http://ark.cdlib.org/ark:/13030/ft9g50091s/*] .**Further reading*** Necia Grant Cooper, Roger Eckhardt, Nancy Shera, editors, "From Cardinals to Chaos", Cambridge University Press (1989). Reminiscences by people close to Ulam, memorial articles on aspects of his work, and previously unpublished informal work by him.

**External links***

* [*http://alsos.wlu.edu/qsearch.aspx?browse=people/Ulam,+Stanislaw Annotated bibliography for Stanislaw Ulam from the Alsos Digital Library*]

* [*http://www.fas.org/sgp/othergov/doe/lanl/pubs/00285736.pdf A biographical article on Ulam by Gian-Carlo Rota*]

*MathGenealogy |id=12682

* [*http://www.ulam.usm.edu Ulam Quarterly Journal*] ISSN|1071-7021

* [*http://www.lanl.gov/history/people/S_Ulam.shtml Stan Ulam's Biography*] – from LANL

* [*http://www-hto.usc.edu/papers/msw_papers/msw-065.pdf Stanislaw Ulam’s Contributions to Theoretical Biology*] in " [*http://www.springer.com/west/home/physics?SGWID=4-10100-70-35504569-0 Letters in Mathematical Physics*] ", 1985. Ulam's contributions to theoretical biology are reviewed in terms of his work in cellular automata theory, population biology, Fermi-Pasta-Ulam results, pattern recognition, and biometric spaces.

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**Stanisław Ulam**— Stanislaw Ulam Pour les articles homonymes, voir Ulam. Photo du badge de Stanisław Ulam à Los Alamos Stanisław Marcin Ulam (13 avril, 1909 13 mai 1984) f … Wikipédia en Français**Stanislaw Ulam**— (Foto auf seinem Los Alamos Dienstausweis während des 2. Weltkriegs) Stanisław Marcin Ulam, auch Stanley Ulam (* 13. April 1909 in Lwów; † 13. Mai 1984 in Santa Fe) war ein polnischer Mathematiker. Stanislaw Ulams Ma … Deutsch Wikipedia**Stanisław Ulam**— Stanislaw Ulam (Foto auf seinem Los Alamos Dienstausweis während des 2. Weltkriegs) Stanisław Marcin Ulam, auch Stanley Ulam (* 13. April 1909 in Lwów; † 13. Mai 1984 in Santa Fe) war ein polnischer Mathematiker. Stanislaw Ulams Ma … Deutsch Wikipedia**Stanislaw Ulam**— Pour les articles homonymes, voir Ulam. Photo du badge de Stanisław Ulam à Los Alamos Stanisław Marcin Ulam (13 avril 1909 13 mai 1984) est un mathématicien américain d origine polonaise. Il aida à développer … Wikipédia en Français**Stanisław Ulam**— Este artículo o sección necesita referencias que aparezcan en una publicación acreditada, como revistas especializadas, monografías, prensa diaria o páginas de Internet fidedignas. Puedes añadirlas así o avisar … Wikipedia Español**Stanislaw Marcin Ulam**— Stanislaw Ulam Pour les articles homonymes, voir Ulam. Photo du badge de Stanisław Ulam à Los Alamos Stanisław Marcin Ulam (13 avril, 1909 13 mai 1984) f … Wikipédia en Français**Stanislaw Marcin Ulam**— Stanislaw Ulam (Foto auf seinem Los Alamos Dienstausweis während des 2. Weltkriegs) Stanisław Marcin Ulam, auch Stanley Ulam (* 13. April 1909 in Lwów; † 13. Mai 1984 in Santa Fe) war ein polnischer Mathematiker. Stanislaw Ulams Ma … Deutsch Wikipedia**Stanisław Marcin Ulam**— Stanislaw Ulam (Foto auf seinem Los Alamos Dienstausweis während des 2. Weltkriegs) Stanisław Marcin Ulam, auch Stanley Ulam (* 13. April 1909 in Lwów; † 13. Mai 1984 in Santa Fe) war ein polnischer US amerikanischer Mathematiker.… … Deutsch Wikipedia**Ulam**— Stanislaw Ulam (Foto auf seinem Los Alamos Dienstausweis während des 2. Weltkriegs) Stanisław Marcin Ulam, auch Stanley Ulam (* 13. April 1909 in Lwów; † 13. Mai 1984 in Santa Fe) war ein polnischer Mathematiker. Stanislaw Ulams Ma … Deutsch Wikipedia**Ulam**— is a surname and may refer to: * Adam Ulam (1922–2000), Polish American professor of History and Political Science at Harvard University * Stanislaw Ulam (1909–1984), Polish born American mathematician who participated in the Manhattan Project ** … Wikipedia