Benoit Mandelbrot
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Benoit ^{[n 1]} Mandelbrot  

At a TED conference in 2010.


Born  Warsaw, Poland 
20 November 1924
Died  Script error: The function "death_date_and_age" does not exist. Cambridge, Massachusetts, United States 
Residence 

Nationality 

Fields  
Institutions  
Alma mater  École Polytechnique California Institute of Technology University of Paris 
Doctoral students  
Known for  
Influences  Johannes Kepler 
Influenced  Nassim Nicholas Taleb 
Notable awards 
2003 Japan Prize 1993 Wolf Prize 1989 Harvey Prize 1986 Franklin Medal 1985 Barnard Medal 
Spouse 
Aliette Kagan
married 1955–2010 (his death) 
Benoit B. ^{[n 1]} Mandelbrot ^{[n 2]} (20 November 1924 – 14 October 2010) was a Polishborn, French and American mathematician. He is recognized for his contribution to the field of fractal geometry, which included coining the word "fractal" as well as for developing a "theory of roughness" and "selfsimilarity" in nature. He later discovered the Mandelbrot set of intricate, neverending fractal shapes, named in his honor.^{[6]}
In 1936, while he was a child, Mandelbrot's family migrated to France. After World War II ended, Mandelbrot studied mathematics, graduating from universities in Paris and the United States and receiving a master's degree in aeronautics from the California Institute of Technology. He spent most of his career in both the United States and France, having dual French and American citizenship. In 1958, he began a 35year career at IBM, where he became 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. By doing so, 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".^{[7]} He later discovered the Mandelbrot set of intricate, neverending fractal shapes, named in his honor. His research career included contributions to such fields as geology, medicine, cosmology, engineering and the social sciences.
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.^{[8]} 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.
Contents
Early years
Mandelbrot was born in Warsaw during the Second Polish Republic. His family was Jewish. Although his father made his living trading clothing, the family had a strong academic tradition and his mother was a dental surgeon.^{[9]} He was first introduced to mathematics by two of his uncles, one of whom, Szolem Mandelbrojt, was a mathematician who resided in Paris. According to Mandelbrot's autobiography, "[t]he love of his [Szolem's] mind was mathematics".^{[10]}^{: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.^{[10]}^{:17}^{[11]} 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 BrivelaGaillarde, to continue his studies.^{[12]}^{[13]} Much of France was occupied by the Nazis at the time, and Mandelbrot recalls this period:
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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?^{[10]}^{: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.^{[9]}
Research career
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.^{[14]} 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.^{[14]} He remained at IBM for 35 years, becoming an IBM Fellow, and later Fellow Emeritus.^{[9]}
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.
States of randomness and financial markets
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.^{[15]}
Developing "fractal geometry" and the Mandelbrot set
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.^{[16]} 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".
In 1975, Mandelbrot coined the term fractal to describe these structures and first published his ideas, and later translated, Fractals: Form, Chance and Dimension.^{[17]} 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."^{[7]} 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":
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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.^{[7]}
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."^{[7]} He points out an unexpected conclusion:
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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.^{[7]}
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 "wouldbe Kepler", after the 17thcentury scientist Johannes Kepler, who calculated and described the orbits of the planets.^{[18]}
Mandelbrot, however, never felt he was inventing a new idea. He describes his feelings in a documentary with science writer Arthur C. Clarke:
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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.^{[19]}
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."^{[19]}
Mandelbrot left IBM in 1987, after 35 years and 12 days, when IBM decided to end pure research in his division.^{[20]} He joined the Department of Mathematics at Yale, and obtained his first tenured post in 1999, at the age of 75.^{[21]} At the time of his retirement in 2005, he was Sterling Professor of Mathematical Sciences.
Fractals and the "theory of roughness"
Mandelbrot created the firstever "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.^{[10]}^{:xi} He began by asking himself various kinds of questions related to nature:
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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?^{[10]}^{:xii}
In his paper entitled How Long Is the Coast of Britain? Statistical SelfSimilarity and Fractional Dimension published in Science in 1967 Mandelbrot discusses selfsimilar curves that have Hausdorff dimension that are examples of fractals, although Mandelbrot does not use this term in the paper, as he did not coin it until 1975. The paper is one of Mandelbrot's first publications on the topic of fractals.^{[22]}^{[23]}
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."^{[10]}^{: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 nonintuitive properties. Mandelbrot brought these objects together for the first time and turned them into essential tools for the longstalled effort to extend the scope of science to explaining nonsmooth, "rough" objects in the real world. His methods of research were both old and new:
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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.^{[10]}^{:292}
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^{[24]} and a maverick.^{[25]} 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 nonspecialists. 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.^{[26]}
Awards and honors
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.^{[27]} Mandelbrot was promoted to Officer of the Legion of Honour in January 2006.^{[28]} An honorary degree from Johns Hopkins University was bestowed on Mandelbrot in the May 2010 commencement exercises.^{[29]}
A partial list of awards received by Mandelbrot:^{[30]}
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 2004 Best Business Book of the Year Award
 AMS Einstein Lectureship
 Barnard Medal
 Caltech Service
 Casimir Funk Natural Sciences Award
 Charles Proteus Steinmetz Medal
 Franklin Medal
 Harvey Prize (1989)
 Honda Prize
 Humboldt Preis
 Fellow, American Geophysical Union
 IBM Fellowship
 Japan Prize (2003)
 John Scott Award
 Légion d'honneur (Legion of Honour)
 Lewis Fry Richardson Medal
 Medaglia della Presidenza della Repubblica Italiana
 Médaille de Vermeil de la Ville de Paris
 Nevada Prize
 Member of the Norwegian Academy of Science and Letters.^{[31]}
 Science for Art
 Sven BerggrenPriset
 Władysław Orlicz Prize
 Wolf Foundation Prize for Physics (1993)
Death and legacy
Wikinews has related news: Mathematician Benoît Mandelbrot dies aged 85 
Mandelbrot died from pancreatic cancer at the age of 85 in a hospice in Cambridge, Massachusetts on 14 October 2010.^{[1]}^{[32]} Reacting to news of his death, mathematician HeinzOtto Peitgen said: "[I]f we talk about impact inside mathematics, and applications in the sciences, he is one of the most important figures of the last fifty years."^{[1]}
Chris Anderson, TED conference curator, described Mandelbrot as "an icon who changed how we see the world".^{[33]} Nicolas Sarkozy, President of France at the time of Mandelbrot's death, said Mandelbrot had "a powerful, original mind that never shied away from innovating and shattering preconceived notions [… h]is work, developed entirely outside mainstream research, led to modern information theory."^{[34]} Mandelbrot's obituary in The Economist points out his fame as "celebrity beyond the academy" and lauds him as the "father of fractal geometry".^{[35]}
Bestselling essayistauthor Nassim Nicholas Taleb, a Mandelbrot protégé and a scientific adviser at Universa Investments, has remarked that Mandelbrot's book The (Mis)Behavior of Markets is in his opinion "The deepest and most realistic finance book ever published."^{[36]}
References in popular culture
In 2004, the American singersongwriter Jonathan Coulton wrote "The Mandelbrot Set", a song dedicated to Mandelbrot and his famous fractal.
See also
External video  

Family background and early education, (4:11) Benoit Mandelbrot interview, Part 1 of 144, Web of Stories^{[37]} 
Notes
 ↑ ^{1.0} ^{1.1} In his autobiography, Mandelbrot did not add a circumflex to the "i" (i.e. "î") in his first name. He [sometimes?] included "B" as a middle initial, which stands for "Benoit B Mandelbrot".^{[1]}^{[2]}^{[3]}
 ↑ Pronounced /ˈmændəlbrɒt/ MANdəlbrot in English.^{[4]} When speaking in French, Mandelbrot pronounced his name [bənwa mɑ̃dɛlbʁot].^{[5]}
References
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 ↑ Lua error in package.lua at line 80: module 'strict' not found. (Subscription or UK public library membership required.)
 ↑ Recording of the ceremony on 11 September 2006 at which Mandelbrot received the insignia for an Officer of the Légion d'honneur.
 ↑ Lua error in package.lua at line 80: module 'strict' not found.
 ↑ ^{7.0} ^{7.1} ^{7.2} ^{7.3} ^{7.4} Wolfram, Stephen. "The Father of Fractals", Wall Street Journal, 22 November 2012
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 ↑ ^{10.0} ^{10.1} ^{10.2} ^{10.3} ^{10.4} ^{10.5} ^{10.6} Mandelbrot, Benoit. The Fractalist: Memoir of a Scientific Maverick, Pantheon Books (2012)
 ↑ Lua error in package.lua at line 80: module 'strict' not found.
 ↑ Hemenway P. Divine proportion: Phi in art, nature and science. Psychology Press, 2005 ISBN 0415344956
 ↑ See, Mandelbrot, 2013, p. 6263.
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 ↑ The Fractal Geometry of Nature, by Benoît Mandelbrot; W H Freeman & Co, 1982; ISBN 0716711869
 ↑ Fractals: Form, Chance and Dimension, by Benoît Mandelbrot; W H Freeman and Co, 1977; ISBN 0716704730
 ↑ Ivry, Benjamin. "Benoit Mandelbrot Influenced Art and Mathematics", Forward, 17 November 2012
 ↑ ^{19.0} ^{19.1} "Arthur C Clarke – Fractals – The Colors Of Infinity", video interviews, 54 min.
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 ↑ "Dr. Mandelbrot traced his work on fractals to a question he first encountered as a young researcher: how long is the coast of Britain?": Benoit Mandelbrot (1967). "Benoît Mandelbrot, Novel Mathematician, Dies at 85", The New York Times.
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 ↑ Galaxy Map Hints at Fractal Universe, by Amanda Gefter; New Scientist; 25 June 2008
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 ↑ Benoît Mandelbrot's obituary (The Economist)
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Further reading
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 HeinzOtto Peitgen, Hartmut Jürgens, Dietmar Saupe and Cornelia Zahlten: Fractals: An Animated Discussion (63 min video film, interviews with Benoît Mandelbrot and Edward Lorenz, computer animations), W.H. Freeman and Company, 1990. ISBN 0716722135 (republished by Films for the Humanities & Sciences, ISBN 9780736505208)
 Mandelbrot, Benoit B.; Fractals and Scaling in Finance: Discontinuity, Concentration, Risk, Springer, 1997
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 Mandelbrot, Benoit B., Gaussian SelfAffinity and Fractals, Springer: 2002.
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 "Hunting the Hidden Dimension: mysteriously beautiful fractals are shaking up the world of mathematics and deepening our understanding of nature", NOVA, WGBH TV, PBS, 28 October 2008.
 Mandelbrot, Benoit B.; The Fractalist. Memoir of a Scientific Maverick. Vintage Books, New York, 2013 (ISBN 9780307389916).
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References
Wikimedia Commons has media related to Lua error in package.lua at line 80: module 'strict' not found.. 
Wikiquote has quotations related to: Benoit Mandelbrot 
 Benoit Mandelbrot at the Mathematics Genealogy Project
 Mandelbrot's page at Yale
 "Benoît Mandelbrot: Fractals and the art of roughness" (TED address).
 Fractals in Science, Engineering and Finance (lecture).
 FT.com interview on the subject of the financial markets which includes his critique of the "efficient market" hypothesis.
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 Mandelbrot relates his life story (Web of Stories).
 Interview (January 1, 1981, Ithaca, NY) held by the Eugene Dynkin Collection of Mathematics Interviews, Cornell University Library.
 Video animation of Mandelbrot set, zoom factor 10^{342}.
 Video animation of Mandelbulb on YouTube, a threedimensional Mandelbrotset projection.
 Video flythrough an animated Mandelbulb world on YouTube
 Benoit Mandelbrot at the Internet Movie Database
 Benoit Mandelbrot at TED
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