Contents 1 Early years 2 Research career 2.1 States of randomness and financial markets 2.2 Developing "fractal geometry" and the Mandelbrot set 2.3 Fractals and the "theory of roughness" 3 Awards and honors 4 Death and legacy 5 Bibliography 5.1 in English 5.2 In French 6 References in popular culture 7 See also 8 Notes 9 References 10 Bibliography 11 Further reading 12 External links

Early years[edit] 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.[14] 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, The Fractalist - Memoir of a Scientific Maverick,[15] "[t]he love of his [Szolem's] mind was mathematics".[9]: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.[9]:17[16] 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.[9]:62–63[17] 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?[9]: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.[14]

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.[18] 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.[18] He remained at IBM for 35 years, becoming an IBM Fellow, and later Fellow Emeritus.[14] 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[edit] 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.[19] Developing "fractal geometry" and the Mandelbrot set[edit] 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.[20] 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 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, 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."[11] 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.[11] 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."[11] 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.[11] 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.[23] 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."[23] Mandelbrot left IBM in 1987, after 35 years and 12 days, when IBM decided to end pure research in his division.[24] He joined the Department of Mathematics at Yale, and obtained his first tenured post in 1999, at the age of 75.[25] At the time of his retirement in 2005, he was Sterling Professor of Mathematical Sciences. 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.[9]: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?[9]:xii In his paper titled How Long Is the Coast of Britain? Statistical Self-Similarity and Fractional Dimension published in Science in 1967 Mandelbrot discusses self-similar 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.[26][27] 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."[9]: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.[9]: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 work of art, and a visionary[28] and a maverick.[29] 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.[30]

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,[31] 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 Chevalier in France's Legion of Honour. In December 2005, Mandelbrot was appointed to the position of Battelle Fellow at the Pacific Northwest National Laboratory.[32] Mandelbrot was promoted to an Officer of the Legion of Honour in January 2006.[33] An honorary degree from Johns Hopkins University was bestowed on Mandelbrot in the May 2010 commencement exercises.[34] A partial list of awards received by Mandelbrot:[35] 2004 Best Business Book of the Year Award AMS Einstein Lectureship Barnard Medal Caltech Service Casimir Funk Natural Sciences Award Charles Proteus Steinmetz Medal Fellow, American Geophysical Union Fellow of the American Statistical Association[36] Franklin Medal Harvey Prize (1989) Honda Prize Humboldt Preis 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.[37] Science for Art Sven Berggren-Priset Władysław Orlicz Prize Wolf Foundation Prize for Physics (1993)

Death and legacy[edit] 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][38] Reacting to news of his death, mathematician Heinz-Otto 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".[39] 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."[40] Mandelbrot's obituary in The Economist points out his fame as "celebrity beyond the academy" and lauds him as the "father of fractal geometry".[41] Best-selling essayist-author 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".[10]

Bibliography[edit] in English[edit] Fractals: Form, Chance and Dimension, 1977 The Fractal Geometry of Nature, 1982 Fractals and Scaling in Finance: Discontinuity, Concentration, Risk. Selecta Volume E, 1997 by Benoit B. Mandelbrot and R.E. Gomory Fractales, hasard et finance, 1959-1997, Nov 1, 1998 Multifractals and 1/ƒ Noise: Wild Self-Affinity in Physics (1963–1976) (Selecta; V.N) Jan 18, 1999 by J.M. Berger and Benoit B. Mandelbrot Gaussian Self-Affinity and Fractals: Globality, The Earth, 1/f Noise, and R/S (Selected Works of Benoit B. Mandelbrot) Dec 14, 2001 by Benoit Mandelbrot and F.J. Damerau Fractals and Chaos: The Mandelbrot Set and Beyond, Jan 9, 2004 The Misbehavior of Markets: A Fractal View of Financial Turbulence, 2006 by Benoit Mandelbrot and Richard L. Hudson The Fractalist: Memoir of a Scientific Maverick, 2014 In French[edit] La forme d'une vie. Mémoires (1924-2010) by Benoît Mandelbrot (Author), Johan-Frédérik Hel Guedj (Translator)

References in popular culture[edit] In 2004, the American singer-songwriter Jonathan Coulton wrote "Mandelbrot Set". In 2007, the author Laura Ruby published "The Chaos King," which includes a character named Mandelbrot and discussion of chaos theory. In 2017, Zach Weinersmith' webcomic, Saturday Morning Breakfast Cereal, portrayed Mandelbrot.[42]

See also[edit] External video Family background and early education, (4:11) Benoit Mandelbrot interview, Part 1 of 144, Web of Stories[43] "How Long is the Coast of Britain?" Louis Bachelier Zipf-Mandelbrot law Seven states of randomness Skewness risk Kurtosis risk Fractal dimension Lacunarity Self-similarity Self-affinity Hurst exponent Fractional Brownian motion Multifractal system 1/f noise Mandelbrot Competition

Notes[edit] ^ a b In his autobiography, Mandelbrot did not add a circumflex to the "i" (i.e. "î") in his first name. He included "B" as a middle initial. The New York Times obituary stated that "he added the middle initial himself, though it does not stand for a middle name".[1] But other sources suggest that he intended his middle initial B. to recursively mean Benoit B. Mandelbrot, thereby including a fractal (his mathematical discovery) in his own name.[2][3] ^ Pronounced /ˈmændəlbrɒt/ MAN-dəl-brot in English.[4] When speaking in French, Mandelbrot pronounced his name [bənwa mɑ̃dɛlbʁot].[5]

References[edit] ^ a b c Hoffman, Jascha (16 October 2010). "Benoît Mandelbrot, Mathematician, Dies at 85". The New York Times. Retrieved 16 October 2010.  ^ a b Lesmoir-Gordon, Nigel (17 October 2010). "Benoît Mandelbrot obituary". The Guardian. London. Retrieved 17 October 2010.  ^ Selinker, Mike (18 October 2010). "Never Trend Away: Jonathan Coulton on Benoit Mandelbrot". Wired.  ^ "Mandelbrot". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005.  (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. ^ ^ Benoit Mandelbrot: Fractals and the art of roughness. (February 2010) ^ Hudson & Mandelbrot, Prelude, page xviii ^ a b c d e f g h i Mandelbrot, Benoit (2012). The Fractalist: Memoir of a Scientific Maverick, Pantheon Books. ISBN 978-0-307-38991-6. ^ a b Gomory, R. (2010). "Benoît Mandelbrot (1924–2010)". Nature. 468 (7322): 378. Bibcode:2010Natur.468..378G. doi:10.1038/468378a. PMID 21085164.  ^ a b c d e Wolfram, Stephen. "The Father of Fractals", Wall Street Journal, 22 November 2012 ^ list includes specific sciences mentioned in Hudson & Mandelbrot, the Prelude, p. xvi, and p. 26 ^ Steve Olson (November–December 2004). "The Genius of the Unpredictable". Yale Alumni Magazine. Retrieved 22 July 2014.  ^ a b c Mandelbrot, Benoît (2002). "The Wolf Prizes for Physics, A Maverick's Apprenticeship" (PDF). Imperial College Press.  ^ Mandelbrot, Benoit (2014-01-14). The Fractalist: Memoir of a Scientific Maverick (Reprint ed.). Vintage. ISBN 9780307389916.  ^ "BBC News – 'Fractal' mathematician Benoît Mandelbrot dies aged 85". BBC Online. 17 October 2010. Retrieved 17 October 2010.  ^ Hemenway P. (2005) Divine proportion: Phi in art, nature and science. Psychology Press. ISBN 0-415-34495-6 ^ a b Barcellos, Anthony (1984). "Mathematical People, Interview of B. B. Mandelbrot" (PDF). Birkhaüser.  ^ "''New Scientist'', 19 April 1997". 19 April 1997. Retrieved 17 October 2010.  ^ The Fractal Geometry of Nature, by Benoît Mandelbrot; W H Freeman & Co, 1982; ISBN 0-7167-1186-9 ^ Fractals: Form, Chance and Dimension, by Benoît Mandelbrot; W H Freeman and Co, 1977; ISBN 0-7167-0473-0 ^ Ivry, Benjamin. "Benoit Mandelbrot Influenced Art and Mathematics", Forward, 17 November 2012 ^ a b "Arthur C Clarke – Fractals – The Colors Of Infinity", video interviews, 54 min. ^ Mandelbrot, Benoît; Bernard Sapoval; Daniel Zajdenweber (May 1998). "Web of Stories • Benoît Mandelbrot • IBM: background and policies". Web of Stories. Retrieved 17 October 2010.  ^ Tenner, Edward (16 October 2010). "Benoît Mandelbrot the Maverick, 1924–2010". The Atlantic. Retrieved 16 October 2010.  ^ "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. ^ Mandelbrot, Benoit B. (5 May 1967). "How long is the coast of Britain? Statistical self-similarity and fractional dimension" (PDF). Science. 156 (3775): 636–638. doi:10.1126/science.156.3775.636. PMID 17837158.  ^ Devaney, Robert L. (2004). ""Mandelbrot's Vision for Mathematics" in Proceedings of Symposia in Pure Mathematics. Volume 72.1" (PDF). American Mathematical Society. Archived from the original (PDF) on 9 December 2006. Retrieved 5 January 2007.  ^ Jersey, Bill (24 April 2005). "A Radical Mind". Hunting the Hidden Dimension. NOVA/ PBS. Retrieved 20 August 2009.  ^ Galaxy Map Hints at Fractal Universe, by Amanda Gefter; New Scientist; 25 June 2008 ^ Laureates of the Japan Prize. ^ "PNNL press release: Mandelbrot joins Pacific Northwest National Laboratory". 16 February 2006. Retrieved 17 October 2010.  ^ "''Légion d'honneur'' announcement of promotion of Mandelbrot to ''officier''" (in French). Retrieved 17 October 2010.  ^ "Six granted honorary degrees, Society of Scholars inductees recognized". 7 June 2010. Retrieved 17 October 2010.  ^ Mandelbrot, Benoit B. (2 February 2006). "Vita and Awards (Word document)". Retrieved 6 January 2007.  Retrieved from Internet Archive 15 December 2013. ^ View/Search Fellows of the ASA, accessed 2016-08-20. ^ "Gruppe 1: Matematiske fag" (in Norwegian). Norwegian Academy of Science and Letters. Retrieved 7 October 2010.  ^ "Benoît Mandelbrot, fractals pioneer, dies". United Press International. 16 October 2010. Retrieved 17 October 2010.  ^ "Mandelbrot, father of fractal geometry, dies". The Gazette. Archived from the original on 19 October 2010. Retrieved 16 October 2010.  ^ "Sarkozy rend hommage à Mandelbrot" [Sarkozy pays homage to Mandelbrot]. Le Figaro (in French). Retrieved 17 October 2010.  ^ Benoît Mandelbrot's obituary. The Economist (21 October 2010) ^ ^ 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. 

Bibliography[edit] Hudson, Richard L.; Mandelbrot, Benoît B. (2004). The (Mis)Behavior of Markets: A Fractal View of Risk, Ruin, and Reward. New York: Basic Books. ISBN 0-465-04355-0. 

Further reading[edit] Mandelbrot, Benoit B. (2010). The Fractalist, Memoir of a Scientific Maverick. New York: Vintage Books, Division of Random House. ISBN 978-0-307-38991-6 Mandelbrot, Benoît B. (1983). The Fractal Geometry of Nature. San Francisco: W.H. Freeman. ISBN 0-7167-1186-9.  Heinz-Otto 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 0-7167-2213-5 (re-published by Films for the Humanities & Sciences, ISBN 978-0-7365-0520-8) Mandelbrot, Benoit B. (1997) Fractals and Scaling in Finance: Discontinuity, Concentration, Risk, Springer. Mandelbrot, Benoît (February 1999). "A Multifractal Walk down Wall Street". Scientific American. 280 (2): 70. Bibcode:1999SciAm.280b..70M. doi:10.1038/scientificamerican0299-70.  Mandelbrot, Benoit B., Gaussian Self-Affinity and Fractals, Springer: 2002. Mandelbrot, Benoît; Taleb, Nassim (23 March 2006). "A focus on the exceptions that prove the rule". Financial Times. Retrieved 17 October 2010.  "Hunting the Hidden Dimension: mysteriously beautiful fractals are shaking up the world of mathematics and deepening our understanding of nature", NOVA, WGBH Educational Foundation, Boston for PBS, first aired 28 October 2008. Frame, Michael; Cohen, Nathan (2015). Benoit Mandelbrot: A Life in Many Dimensions. Singapore: World Scientific Publishing Company. ISBN 978-981-4366-06-9.  Mandelbrot, B. (1959) Variables et processus stochastiques de Pareto-Levy, et la repartition des revenus. Comptes Rendus Acad. Sci. Paris, 249, 613–615. Mandelbrot, B. (1960) The Pareto-Levy law and the distribution of income. International Economic Review, 1, 79–106. Mandelbrot, B. (1961) Stable Paretian random functions and the multiplicative variation of income. Econometrica, 29, 517–543. Mandelbrot, B. (1964) Random walks, fire damage amount and other Paretian risk phenomena. Operations Research, 12, 582–585.

External links[edit] Wikimedia Commons has media related to Benoît Mandelbrot. 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). interview on the subject of the financial markets which includes his critique of the "efficient market" hypothesis. Taylor, Richard (2011). "Obituaries: Benoit Mandelbrot". Physics Today. 64 (6): 63. Bibcode:2011PhT....64f..63T. doi:10.1063/1.3603925. [permanent dead link] Mandelbrot relates his life story (Web of Stories). Interview (1 January 1981, Ithaca, NY) held by the Eugene Dynkin Collection of Mathematics Interviews, Cornell University Library. Video animation of Mandelbrot set, zoom factor 10342. Video animation of Mandelbulb on YouTube, a three-dimensional Mandelbrot-set projection. 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Benoit_Mandelbrot - Photos and All Basic Informations

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