Benoit Mandelbrot

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Benoît Mandelbrot
Benoit Mandelbrot mg 1804-d.jpg
Mandelbrot in 2007
Born (1924-11-20)20 November 1924
Warsaw, Poland
Died 14 October 2010(2010-10-14) (aged 85)
Cambridge, Massachusetts, United States
Residence Poland, France, United States
Nationality Polish, French, American
Fields Mathematics, Aerodynamics
Institutions Yale University
International Business Machines (IBM)
Pacific Northwest National Laboratory
Alma mater École Polytechnique
California Institute of Technology
University of Paris
Doctoral advisor Paul Lévy
Doctoral students Laurent Calvet
Eugene Fama
Ken Musgrave
Murad Taqqu
Daniel Zajdenweber
Known for Mandelbrot set
Fractals
Chaos Theory
Zipf–Mandelbrot law
Influences Johannes Kepler
Notable awards Harvey Prize (1989)
Wolf Prize (1993)
Japan Prize (2003)
Franklin Medal
Légion d'honneur
Spouse Aliette Kagan (1955–2010, his death)

Benoît B. Mandelbrot[note 1][note 2] (20 November 1924 – 14 October 2010) was a Polish-born, French and American mathematician, noted for developing a "theory of roughness" in nature and the field of fractal geometry to help prove it, which included coining the word "fractal". He later discovered the Mandelbrot set of intricate, never-ending fractal shapes, named in his honor.[7]

While he was a child, his family fled to France in 1936 to escape the growing Nazi persecution of Jews. After World War II ended in 1945, Mandelbrot studied mathematics, graduating from universities in Paris and the U.S., receiving a masters degree in aeronautics from Caltech. He spent most of his career in both the U.S. and France, having dual French and American citizenship. In 1958 he began working for IBM, where he stayed for 35 years and was an IBM Fellow.

Because of his access to IBM's computers, Mandelbrot was one of the first to use computer graphics to create and display fractal geometric images, leading to his discovering the Mandelbrot set in 1979. In so doing, he was able to show how visual complexity can be created from simple rules. He said that things typically considered to be "rough", a "mess" or "chaotic", like clouds or shorelines, actually had a "degree of order".[8] His research career included contributions to fields including geology, medicine, cosmology, engineering and the social sciences. Science writer Arthur C. Clarke credits the Mandelbrot set as being "one of the most astonishing discoveries in the entire history of mathematics".[9]

Toward the end of his career, he was Sterling Professor of Mathematical Sciences at Yale University, where he was the oldest professor in Yale's history to receive tenure.[10] Mandelbrot also held positions at the Pacific Northwest National Laboratory, Université Lille Nord de France, Institute for Advanced Study and Centre National de la Recherche Scientifique. During his career, he received over 15 honorary doctorates and served on many science journals, along with winning numerous awards. His autobiography, The Fractalist, was published in 2012.

Early years[edit]

Mandelbrot was born in Warsaw. His family had a strong academic tradition — his mother was a dental surgeon, although his father made his living trading clothing.[11] He was first introduced to mathematics by two of his uncles, one of whom, Szolem Mandelbrojt, was a mathematician who resided in Paris. "The love of his mind was mathematics," writes Mandelbrot, in his autobiography.[12]:16

The family emigrated from Poland to France in 1936 when he was 11. "The fact that my parents, as economic and political refugees, joined Szolem in France saved our lives," he writes.[12]:17[13] Mandelbrot attended the Lycée Rolin in Paris until the start of World War II, when his family then moved to Tulle, France. He was helped by Rabbi David Feuerwerker, the Rabbi of Brive-la-Gaillarde, to continue his studies.[14][15] Much of France was occupied by the Nazis at the time, and Mandelbrot recalls this period:

Our constant fear was that a sufficiently determined foe might report us to an authority and we would be sent to our deaths. This happened to a close friend from Paris, Zina Morhange, a physician in a nearby county seat. Simply to eliminate the competition, another physician denounced her.... We escaped this fate. Who knows why?[12]:49

In 1944, Mandelbrot returned to Paris, studied at the Lycée du Parc in Lyon, and in 1945 to 1947 attended the École Polytechnique, where he studied under Gaston Julia and Paul Lévy. From 1947 to 1949 he studied at California Institute of Technology, where he earned a master's degree in aeronautics.[2] Returning to France, he obtained his PhD degree in Mathematical Sciences at the University of Paris in 1952.[11]

Research career[edit]

From 1949 to 1958, Mandelbrot was a staff member at the Centre National de la Recherche Scientifique. During this time he spent a year at the Institute for Advanced Study in Princeton, New Jersey, where he was sponsored by John von Neumann. In 1955 he married Aliette Kagan and moved to Geneva, Switzerland, and later to the Université Lille Nord de France.[16] In 1958 the couple moved to the United States where Mandelbrot joined the research staff at the IBM Thomas J. Watson Research Center in Yorktown Heights, New York.[16] He remained at IBM for 35 years, becoming an IBM Fellow, and later Fellow Emeritus.[11]

Mandelbrot working at IBM

From 1951 onward, Mandelbrot worked on problems and published papers not only in mathematics but in applied fields such as information theory, economics, and fluid dynamics.

Mandelbrot found that price changes in financial markets did not follow a Gaussian distribution, but rather Lévy stable distributions having theoretically infinite variance. He found, for example, that cotton prices followed a Lévy stable distribution with parameter α equal to 1.7 rather than 2 as in a Gaussian distribution. "Stable" distributions have the property that the sum of many instances of a random variable follows the same distribution but with a larger scale parameter.[17]

As a visiting professor at Harvard University, Mandelbrot began to study fractals called Julia sets that were invariant under certain transformations of the complex plane. Building on previous work by Gaston Julia and Pierre Fatou, Mandelbrot used a computer to plot images of the Julia sets. While investigating the topology of these Julia sets, he studied the Mandelbrot set fractal that is now named after him. In 1982, Mandelbrot expanded and updated his ideas in The Fractal Geometry of Nature.[18] This influential work brought fractals into the mainstream of professional and popular mathematics, as well as silencing critics, who had dismissed fractals as "program artifacts".

Mandelbrot left IBM in 1987, after 35 years and 12 days, when IBM decided to end pure research in his division.[19] He joined the Department of Mathematics at Yale, and obtained his first tenured post in 1999, at the age of 75.[20] At the time of his retirement in 2005, he was Sterling Professor of Mathematical Sciences.

Developing "fractal geometry" and the Mandelbrot set[edit]

Mandelbrot speaking about the Mandelbrot set, during his acceptance speech for the Légion d'honneur in 2006

In 1975, Mandelbrot coined the term fractal to describe these structures and first published his ideas in 1975, and later translated, Fractals: Form, Chance and Dimension.[21] According to mathematics scientist Stephen Wolfram, the book was a "breakthrough" for Mandelbrot, who until then would typically "apply fairly straightforward mathematics ... to areas that had barely seen the light of serious mathematics before."[8] Wolfram adds that as a result of this new research, he was no longer a "wandering scientist", and later called him "the father of fractals":

Mandelbrot ended up doing a great piece of science and identifying a much stronger and more fundamental idea—put simply, that there are some geometric shapes, which he called "fractals", that are equally "rough" at all scales. No matter how close you look, they never get simpler, much as the section of a rocky coastline you can see at your feet looks just as jagged as the stretch you can see from space.[8]

Wolfram briefly describes fractals as a form of geometric repetition, "in which smaller and smaller copies of a pattern are successively nested inside each other, so that the same intricate shapes appear no matter how much you zoom in to the whole. Fern leaves and Romanesco broccoli are two examples from nature."[8] He points out an unexpected conclusion:

One might have thought that such a simple and fundamental form of regularity would have been studied for hundreds, if not thousands, of years. But it was not. In fact, it rose to prominence only over the past 30 or so years—almost entirely through the efforts of one man, the mathematician Benoit Mandelbrot.[8]

Mandelbrot used the term "fractal" as it derived from the Latin word "fractus", defined as broken or shattered glass. Using the newly developed IBM computers at his disposal, Mandelbrot was able to create fractal images using graphic computer code, images that an interviewer described as looking like "the delirious exuberance of the 1960s psychedelic art with forms hauntingly reminiscent of nature and the human body." He also saw himself as a "would-be Kepler", after the 17th-century scientist Johannes Kepler, who calculated and described the orbits of the planets.[22]

A Mandelbrot set

Mandelbrot, however, never felt he was inventing a new idea. He describes his feelings in a documentary with science writer Arthur C. Clarke:

Exploring this set I certainly never had the feeling of invention. I never had the feeling that my imagination was rich enough to invent all those extraordinary things on discovering them. They were there, even though nobody had seen them before. It's marvelous, a very simple formula explains all these very complicated things. So the goal of science is starting with a mess, and explaining it with a simple formula, a kind of dream of science.[9]

According to Clarke, "the Mandelbrot set is indeed one of the most astonishing discoveries in the entire history of mathematics. Who could have dreamed that such an incredibly simple equation could have generated images of literally infinite complexity?" Clarke also notes an "odd coincidence:" "the name Mandelbrot, and the word "mandala"—for a religious symbol—which I'm sure is a pure coincidence, but indeed the Mandelbrot set does seem to contain an enormous number of mandalas."[9]

Fractals and the "theory of roughness"[edit]

Mandelbrot created the first-ever "theory of roughness", and he saw "roughness" in the shapes of mountains, coastlines and river basins; the structures of plants, blood vessels and lungs; the clustering of galaxies. His personal quest was to create some mathematical formula to measure the overall "roughness" of such objects in nature.[12]:xi He began by asking himself various kinds of questions related to nature:

Can geometry deliver what the Greek root of its name [geo-] seemed to promise—truthful measurement, not only of cultivated fields along the Nile River but also of untamed Earth?[12]:xii

Mandelbrot emphasized the use of fractals as realistic and useful models for describing many "rough" phenomena in the real world. He concluded that "real roughness is often fractal and can be measured."[12]:296 Although Mandelbrot coined the term "fractal", some of the mathematical objects he presented in The Fractal Geometry of Nature had been previously described by other mathematicians. Before Mandelbrot, however, they were regarded as isolated curiosities with unnatural and non-intuitive properties. Mandelbrot brought these objects together for the first time and turned them into essential tools for the long-stalled effort to extend the scope of science to explaining non-smooth, "rough" objects in the real world. His methods of research were both old and new:

The form of geometry I increasingly favored is the oldest, most concrete, and most inclusive, specifically empowered by the eye and helped by the hand and, today, also by the computer ... bringing an element of unity to the worlds of knowing and feeling ... and, unwittingly, as a bonus, for the purpose of creating beauty.[12]:292

section of a Mandelbrot set

Fractals are also found in human pursuits, such as music, painting, architecture, and stock market prices. Mandelbrot believed that fractals, far from being unnatural, were in many ways more intuitive and natural than the artificially smooth objects of traditional Euclidean geometry:

Clouds are not spheres, mountains are not cones, coastlines are not circles, and bark is not smooth, nor does lightning travel in a straight line.
  —Mandelbrot, in his introduction to The Fractal Geometry of Nature

Mandelbrot has been called a visionary[23] and a maverick.[24] His informal and passionate style of writing and his emphasis on visual and geometric intuition (supported by the inclusion of numerous illustrations) made The Fractal Geometry of Nature accessible to non-specialists. The book sparked widespread popular interest in fractals and contributed to chaos theory and other fields of science and mathematics.

Mandelbrot also put his ideas to work in cosmology. He offered in 1974 a new explanation of Olbers' paradox (the "dark night sky" riddle), demonstrating the consequences of fractal theory as a sufficient, but not necessary, resolution of the paradox. He postulated that if the stars in the universe were fractally distributed (for example, like Cantor dust), it would not be necessary to rely on the Big Bang theory to explain the paradox. His model would not rule out a Big Bang, but would allow for a dark sky even if the Big Bang had not occurred.[25]

Awards and honors[edit]

Mandelbrot's awards include the Wolf Prize for Physics in 1993, the Lewis Fry Richardson Prize of the European Geophysical Society in 2000, the Japan Prize in 2003, and the Einstein Lectureship of the American Mathematical Society in 2006.

The small asteroid 27500 Mandelbrot was named in his honor. In November 1990, he was made a Knight in the French Legion of Honour. In December 2005, Mandelbrot was appointed to the position of Battelle Fellow at the Pacific Northwest National Laboratory.[26] Mandelbrot was promoted to Officer of the Legion of Honour in January 2006.[27] An honorary degree from Johns Hopkins University was bestowed on Mandelbrot in the May 2010 commencement exercises.[28]

Death and legacy[edit]

Mandelbrot speaking in 2007

Mandelbrot died in a hospice in Cambridge, Massachusetts, on 14 October 2010 from pancreatic cancer, at the age of 85.[1][29] Reacting to news of his death, mathematician Heinz-Otto Peitgen said "if we talk about impact inside mathematics, and applications in the sciences, he is one of the most important figures of the last 50 years."[1]

Chris Anderson, curator of TED conferences, described Mandelbrot as "an icon who changed how we see the world".[30] The President of France at the time of Mandelbrot's death, Nicolas Sarkozy, said Mandelbrot had "a powerful, original mind that never shied away from innovating and shattering preconceived notions". Sarkozy also added, "His work, developed entirely outside mainstream research, led to modern information theory."[31] Mandelbrot's obituary in The Economist points out his fame as "celebrity beyond the academy" and lauds him as the "father of fractal geometry."[32]

Honors and awards[edit]

A partial list of awards received by Mandelbrot:[33]

See also[edit]

External video
Mandelbrot p1130861.jpg
Family background and early education, (4:11) Benoit Mandelbrot interview, Part 1 of 144, Web of Stories[35]

Notes[edit]

  1. ^ Mandelbrot used no accent (circumflex i) for his first name in his autobiography. He chose his own middle initial, but it doesn't stand for anything.[1][2][3] It is, however, widely rumored in popular culture that his middle initial B. stood for Benoit B. Mandelbrot, an allusion to recursion and fractals.[4]
  2. ^ Pronounced /ˈmændəlbrɒt/ MAN-dəl-brot in English.[5] When speaking in French, Mandelbrot pronounced his name [bənwa mɑ̃dɛlbʁot].[6]

References[edit]

  1. ^ a b c Hoffman, Jascha (16 October 2010). "Benoît Mandelbrot, Mathematician, Dies at 85". The New York Times. Retrieved 16 October 2010. 
  2. ^ a b Lesmoir-Gordon, Nigel (17 October 2010). "Benoît Mandelbrot obituary". The Guardian (London). Retrieved 17 October 2010. 
  3. ^ Selinker, Mike (18 October 2010). "Never Trend Away: Jonathan Coulton on Benoit Mandelbrot". Wired. 
  4. ^ "It's Okay To Be Smart • What is Benoit B. Mandelbrot’s middle name?". Itsokaytobesmart.com. 2013-01-23. 
  5. ^ "Mandelbrot". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. 
  6. ^ Recording of the 11 September 2006, ceremony at which Mandelbrot received the Officer of the Legion of Honour insignia
  7. ^ Gomory, R. (2010). "Benoît Mandelbrot (1924–2010)". Nature 468 (7322): 378. doi:10.1038/468378a. PMID 21085164.  edit
  8. ^ a b c d e Wolfram, Stephen. "The Father of Fractals", Wall Street Journal, 22 November 2012
  9. ^ a b c "Arthur C Clarke – Fractals – The Colors Of Infinity", video interviews, 54 min.
  10. ^ Steve Olson (November–December 2004). "The Genius of the Unpredictable". Yale Alumni Magazine. Retrieved 13 December 2012. [dead link]
  11. ^ a b c Mandelbrot, Benoît (2002). "A maverick's apprenticeship". The Wolf Prizes for Physics. Imperial College Press. 
  12. ^ a b c d e f g Mandelbrot, Benoit. The Fractalist: Memoir of a Scientific Maverick, Pantheon Books (2012)
  13. ^ "BBC News – 'Fractal' mathematician Benoît Mandelbrot dies aged 85". BBC Online. 17 October 2010. Retrieved 17 October 2010. 
  14. ^ Hemenway P. Divine proportion: Phi in art, nature and science. Psychology Press, 2005 ISBN 0-415-34495-6
  15. ^ See, Mandelbrot, 2013, p. 62-63.
  16. ^ a b Barcellos, Anthony (1984). "Interview of B. B. Mandelbrot". Mathematical People. Birkhaüser. 
  17. ^ "''New Scientist'', 19 April 1997". Newscientist.com. 19 April 1997. Retrieved 17 October 2010. 
  18. ^ The Fractal Geometry of Nature, by Benoît Mandelbrot; W H Freeman & Co, 1982; ISBN 0-7167-1186-9
  19. ^ Mandelbrot, Benoît; Bernard Sapoval; Daniel Zajdenweber (May 1998). "Web of Stories • Benoît Mandelbrot • IBM: background and policies". Web of Stories. Retrieved 17 October 2010. 
  20. ^ Tenner, Edward (16 October 2010). "Benoît Mandelbrot the Maverick, 1924–2010". The Atlantic. Retrieved 16 October 2010. 
  21. ^ Fractals: Form, Chance and Dimension, by Benoît Mandelbrot; W H Freeman and Co, 1977; ISBN 0-7167-0473-0
  22. ^ Ivry, Benjamin. "Benoit Mandelbrot Influenced Art and Mathematics", Forward, 17 November 2012
  23. ^ Devaney, Robert L. (2004). ""Mandelbrot's Vision for Mathematics" in Proceedings of Symposia in Pure Mathematics. Volume 72.1". American Mathematical Society. Retrieved 5 January 2007. [dead link]
  24. ^ Jersey, Bill (24 April 2005). "A Radical Mind". Hunting the Hidden Dimension. NOVA/ PBS. Retrieved 20 August 2009. 
  25. ^ Galaxy Map Hints at Fractal Universe, by Amanda Gefter; New Scientist; 25 June 2008
  26. ^ "PNNL press release: Mandelbrot joins Pacific Northwest National Laboratory". Pnl.gov. 16 February 2006. Retrieved 17 October 2010. 
  27. ^ "''Légion d'honneur'' announcement of promotion of Mandelbrot to ''officier''" (in (French)). Legifrance.gouv.fr. Retrieved 17 October 2010. 
  28. ^ "Six granted honorary degrees, Society of Scholars inductees recognized". Gazette.jhu.edu. 7 June 2010. Retrieved 17 October 2010. 
  29. ^ "Benoît Mandelbrot, fractals pioneer, dies". United Press International. 16 October 2010. Retrieved 17 October 2010. 
  30. ^ "Mandelbrot, father of fractal geometry, dies". The Gazette. Retrieved 16 October 2010. [dead link]
  31. ^ "Sarkozy rend hommage à Mandelbrot" [Sarkozy pays homage to Mandelbrot]. Le Figaro (in French). Retrieved 17 October 2010. 
  32. ^ Benoît Mandelbrot's obituary (The Economist)
  33. ^ Mandelbrot, Benoît B. (2 February 2006). "Vita and Awards (Word document)". Retrieved 6 January 2007.  Retrieved from Internet Archive 15 December 2013.
  34. ^ "Gruppe 1: Matematiske fag" (in Norwegian). Norwegian Academy of Science and Letters. Retrieved 7 October 2010. 
  35. ^ Mandelbrot, Benoît; Bernard Sapoval; Daniel Zajdenweber (May 1998). "Web of Stories – Benoît Mandelbrot – Family background and early education". Web of Stories. Retrieved 19 October 2010. 

Further reading[edit]

External links[edit]