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Topic: Hadamard, Jacques


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  Jacques Hadamard - Wikipedia, the free encyclopedia
Jacques Solomon Hadamard (December 8, 1865 - October 17, 1963) was a French mathematician best known for his proof of the prime number theorem.
He also gave his name to the Hadamard inequality on volumes, and the Hadamard matrix, on which the Hadamard transform is based.
In sharp opposition to authors who identify language and cognition, he describes his own mathematical thinking as largely wordless, often accompanied by mental images that condense the overall idea of a proof.
en.wikipedia.org /wiki/Jacques_Hadamard   (203 words)

  
 Jacques Hadamard - Wikipedia
Jacques Solomon Hadamard (8 december 1865 – 17 oktober 1963) was een Frans wiskundige.
Daarnaast gaf hij zijn naam aan de Hadamard ongelijkheid over volumes, en de Hadamard matrix, waarop de Hadamard transformatie gebaseerd is, en die onder andere wordt toegepast in de coderingstheorie.
In zijn boek Psychology of Invention in the Mathematical Field, gebruikt Hadamard introspectie om het wiskundige denkproces te beschrijven.
nl.wikipedia.org /wiki/Jacques_Hadamard   (153 words)

  
 Hadamard, Jacques   (Site not responding. Last check: 2007-11-07)
Hadamard was born in Versailles and studied at the Ecole Normale Supérieure in Paris.
Hadamard was able to demonstrate that this number was asymptotically equal to x/log x, which was the most important single result ever obtained in number theory.
Hadamard became interested in the 'functions of lines' - numerical functions that depend upon a curve or an ordinary function as their variable.
cartage.org.lb /en/themes/Biographies/MainBiographies/H/Hadamard/1.html   (366 words)

  
 Jacques Hadamard Biography   (Site not responding. Last check: 2007-11-07)
Jacques Solomon Hadamard (December 8, 1865 - October 17, 1963) was a mathematician best known for his proof of the prime number theorem.
The Hadamard gate in quantum computing uses this matrix.
Hadamard, Jacques, "Psychology of Invention in the Mathematical Field".
www.biographybase.com /biography/Hadamard_Jacques.html   (116 words)

  
 Hadamard
Jacques' young sister Jeanne died in 1870 before the siege of Paris and another sister Suzanne, who was born in 1871, died in 1874.
In 1875 Hadamard's father, having acquired a poor reputation as a teacher, was transferred to the Lycée Louis-le-Grand and Jacques attended this school from 1876.
Hadamard then undertook the hugely difficult task of surveying Poincaré's work and by the end of the summer of 1912 he had produced two major articles.
www-groups.dcs.st-and.ac.uk /~history/Mathematicians/Hadamard.html   (2647 words)

  
 Lizeray Family tree - pafg618 - Generated by Personal Ancestral File   (Site not responding. Last check: 2007-11-07)
Jacques Salomon HADAMARD [Parents] was born on 08 Dec 1865 in Versailles, 78000, Yvelines.
Pierre Amédée Isaac HADAMARD Ingénieur was born on 05 Oct 1894 in Bordeaux, 33000, Gironde.
Etienne HADAMARD was born on 26 Jul 1897 in Cenon, 33150, Gironde.
www.lizeray.com /arbregen/pafg618.htm   (857 words)

  
 Jacques Hadamard Biography / Biography of Jacques Hadamard World of Mathematics Biography
Hadamard was first and foremost a teacher, however, and he used his position to help both students and colleagues alike see the connections between seemingly unrelated fields.
Hadamard's dissertation concerned determining the shape of a function and finding certain points on that function where division by zero was involved in the original equation.
Hadamard's work forming connections between topology and analysis was interrupted in 1904 by a debate over mathematical logic which raged through the mathematical community.
www.bookrags.com /biography-jacques-hadamard-wom   (1192 words)

  
 Jacques Hadamard - Wikipédia
Jacques Salomon Hadamard est un mathématicien français, né le 8 décembre 1865 à Versailles, Paris, mort le 17 octobre 1963 à Paris.
Il a laissé son nom aux matrices de Hadamard et la pseudo-transformation de Hadamard utilisée en cryptographie.
Vladimir Maz'ya et Tatyana Shaposhnikova, Jacques Hadamard, un mathématicien universel, éditions EDP Sciences, 2005.
fr.wikipedia.org /wiki/Jacques_Hadamard   (177 words)

  
 Jacques Hadamard -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-11-07)
Jacques Solomon Hadamard (December 8, 1865 - October 17, 1963) was a (The Romance language spoken in France and in countries colonized by France) French (A person skilled in mathematics) mathematician best known for his proof of the (Click link for more info and facts about prime number theorem) prime number theorem.
He also gave his name to the (Click link for more info and facts about Hadamard inequality) Hadamard inequality on volumes, and the (Click link for more info and facts about Hadamard matrix) Hadamard matrix, on which the (Click link for more info and facts about Hadamard transform) Hadamard transform is based.
In his book (The science of mental life) Psychology of Invention in the Mathematical Field, Hadamard uses (The contemplation of your own thoughts and desires and conduct) introspection to describe mathematical thought processes.
www.absoluteastronomy.com /encyclopedia/J/Ja/Jacques_Hadamard.htm   (338 words)

  
 Read This: Jacques Hadamard, A Universal Mathematician
For instance, Hadamard was involved in the Dreyfus affair in France at the end of the nineteenth century in which a distant cousin of Hadamard by marriage was found guilty of treason, imprisoned, and then later exonerated as a victim of conspiracy and antisemitism.
A professor using Jacques Hadamard, A Universal Mathematician as a primary or secondary source for a class (such as a History of Mathematics course) should be aware that a good deal of mathematical sophistication is required when reading the mathematical component of the text.
Publication Data: Jacques Hadamard, A Universal Mathematician,by Vladimir Maz'ya and Tatyana Shaposhnikova.
www.maa.org /reviews/hadamard.html   (1274 words)

  
 United States Patent Application: 0040034676
Jacques Hadamard published his original work in 1893 and work in similar areas was published by Rademacher in 1922 and Walsh in 1923.
Hadamard matrices and their transforms can be found in signal compression algorithms and encoding and decoding algorithms, for example.
To aid in illustrating the principles of the present invention, the derivation of the transform is described in the context of the correlation of an input sequence consisting of a received signal to an H.sub.16 matrix.
appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040034676".PGNR.&OS=DN/20040034676&RS=DN/20040034676   (8500 words)

  
 Hadamard Variance
The Hadamard [1] variance is based on the Hadamard transform [2], which was adapted by Baugh as the basis of a time-domain measure of frequency stability [3].
The Hadamard total variance is a biased estimator of the Hadamard variance, so a bias correction is required that is dependent on the power law noise type and number of samples.
A comparison of the overlapping and total Hadamard deviations shows the tighter error bars of the latter, allowing an additional point to be shown at the longest averaging factor.
www.stable32.com /paper4ht.htm   (1409 words)

  
 Nat' Academies Press, Prime Obsession: Bernhard Riemann and the Greatest Unsolved Problem in Mathematics (2003)
Jacques Hadamard lived through the siege of Paris as an infant, and the house his family occupied was burned down in the Civil War.
Hadamard actually states in his paper: “Stieltjes has proved that all the imaginary zeros of ζ (s) are (conforming to Riemann’s prediction) of the form, t being real; but his proof has never been published.
Hadamard’s third son, born in February 1899, was named Mathieu-Georges, “Mathieu” after Dreyfus’s brother and most tireless champion, “Georges” after the remarkable Colonel Picquart, whose iron integrity and quiet insistence on telling the truth were key factors in the eventual vindication of Dreyfus (whom Picquart personally detested).
www.nap.edu /openbook.php?record_id=10532&page=151   (5140 words)

  
 Search Results for Hadamard
Amedee Hadamard, who was of a Jewish background, was a teacher who taught several subjects such as classics, grammar, history and geography while Jacques' mother taught piano giving private lessons in their home.
Hadamard was the doyen not only of the Academy of Sciences, to which he was elected in December 1912, in the seat left vacant by the death of Henri Poincare, but of the entire Institut de France.
Jacques Hadamard expressed his opinion that the notions of the theory of sets were known and indispensable instruments.
www-groups.dcs.st-and.ac.uk /history/Search/historysearch.cgi?SUGGESTION=Hadamard&CONTEXT=1   (2987 words)

  
 Jacques Hadamard Book from Books.co.uk   (Site not responding. Last check: 2007-11-07)
This book presents a fascinating story of the long life and great accomplishments of Jacques Hadamard (1865-1963), who was once called "the living legend of mathematics".
Also recounted are Hadamard's worldwide travels, his famous seminar, his passion for botany, his home orchestra, where he played the violin with Einstein, and his interest in the psychology of mathematical creativity.
Hadamard's life is described in a readable and inviting way.
www.books.co.uk /jacques_hadamard/0821819232.html   (310 words)

  
 Jacques Hadamard Article, JacquesHadamard Information   (Site not responding. Last check: 2007-11-07)
Jacques Solomon Hadamard (December 8, 1865 - October 17, 1963)was a mathematician best known for his proof of the prime number theorem.
He introduced the idea of well-posed problem in thetheory of partial differential equations.He also gave his name to the Hadamard inequality on volumes,and the Hadamard matrix, on which the Hadamard transform is based.
In sharp opposition to authors who identify language and cognition, hedescribes his own mathematical thinking as largely wordless, often accompanied by mental images that condense the overall idea of a proof.
www.anoca.org /mathematical/he/jacques_hadamard.html   (217 words)

  
 The Algorithm is Key to Kharaghani’s Success
The Hadamard conjecture has been outstanding for more than a century, and it may continue to be for many more years.
Hadamard matrices have a wide range of applications and are particularly important in data transmissions.
“A Hadamard matrix is a square arrangement of the numbers 1 and -1 in a ‘balanced way.’ In simple language, ‘balancedness’ means that for every two rows of the arrangement, the total number of pairs of ones and minus ones in different columns matches the rest,” says Kharaghani.
www.uleth.ca /notice/display.html?b=4&s=2004   (469 words)

  
 Amazon.ca: Editorial Reviews Books: The Mathematician's Mind: The Psychology of Invention in the Mathematical Field   (Site not responding. Last check: 2007-11-07)
Fifty years ago when Jacques Hadamard set out to explore how mathematicians invent new ideas, he considered the creative experiences of some of the greatest thinkers of his generation, such as George Polya, Claude Lévi-Strauss, and Albert Einstein.
In exploring this phenomenon, Hadamard produced one of the most famous and cogent cases for the existence of unconscious mental processes in mathematical invention and other forms of creativity.
The roots of creativity for Hadamard lie not in consciousness, but in the long unconscious work of incubation, and in the unconscious aesthetic selection of ideas that thereby pass into consciousness.
www.amazon.ca /exec/obidos/tg/detail/-/books/0691029318/reviews   (465 words)

  
 iqexpand.com   (Site not responding. Last check: 2007-11-07)
Look for Jacques hadamard in the Commons, our repository for free images, music, sound, and video.
Life and Work of Jacques Hadamard, Vladimir Maz'ya andamp; T. Shaposhnikova, American Mathematical Society, February 1998, hardcover, 574 pages, ISBN 0821808419 This article about a mathematician is a stub...
Biography of Jacques Hadamard (1865-1963) Jacques Salomon Hadamard Born: 8 Dec 1865 in Versailles, France Died: 17 Oct 1963 in Paris, France Jacques Hadamard 's father, Amédée Hadamard, married...
jacques_hadamard.iqexpand.com   (333 words)

  
 CURRICULUM VITAE
Hadamard actually asked the question of matrices with entries on the unit disc but his name has become associated with the real matrices.
They pioneered the use of computing in the construction of Hadamard matrices, the existence of which is an NPC problem (or a problem which has computational resources exponential in the input to find the answer but easy to check the answer once it has been given).
Hadamard matrices and bent functions are used in the study of the design of S-boxes which are fundamental to the construction of cryptographically strong SPN algorithms (substitution-permutation-network)for private key cryptography.
www.uow.edu.au /~/jennie/lifework.html   (3648 words)

  
 Jacques Hadamard - rFind.net
Du kan också söka efter Jacques Hadamard i andra artiklar på svenska wikipedia.
Klarlade tillsammans med Jacques Monod mycket av mekanismen för hur gen erna styr cell ens funktion och ämnesomsättning.
Frankrikes president Jacques Chirac togs i går kväll in på sjukhus för en mindre störning av synen till följd av vad som kallas en incident med ett blodkärl.
www.rfind.net /info/Jacques_Hadamard   (340 words)

  
 Jacques Hadamard   (Site not responding. Last check: 2007-11-07)
Jacques Solomon Hadamard (de diciembre el 8 de 1865 - de octubre el 17 de 1963) era matemático conocido lo más mejor posible para su prueba del teorema primero del número.
La puerta de Hadamard en aplicaciones que computan del quántum esta matriz.
Hadamard, Jacques, "psicología de la invención en el campo matemático".
www.yotor.net /wiki/es/ja/Jacques%20Hadamard.htm   (237 words)

  
 Additional Reading (from Hadamard, Jacques-Salomon) --  Encyclopædia Britannica
, Jacques Hadamard: A Universal Mathematician (1998), recounts his life in the first half of the book, leaving a more technical description of his work for the second half.
The French composer Jacques Ibert is admired for his colorful, technically polished, and often witty neoclassical style.
The French astronomer Jacques Cassini continued the work of his father, Gian Domenico Cassini.
www.britannica.com /eb/article-225922   (730 words)

  
 Hadamard transform   (Site not responding. Last check: 2007-11-07)
The Hadamard transform (Hadamard transformation, also known as the Walsh-Hadamard transformation) is an example of a generalized class of Fourier transforms.
It is named for the French mathematician Jacques Hadamard.
The Hadamard matrix can also be regarded as the Fourier transform on the two-element additive group of Z/(2).
www.worldhistory.com /wiki/H/Hadamard-transform.htm   (211 words)

  
 Introduction
In commenting on this in his fascinating but quirky monograph, he asks ``What may be the use of such a strange and cloudy imagery?".
Hadamard was of the opinion that mathematical thought is visual and that words only interfered.
And when he inquired into the thought processes of his most distinguished mid-century colleaugues, he discovered that most of them, in some measure, agreed (A notable exception being George Pólya).
www.cecm.sfu.ca /~loki/Papers/Numbers/node2.html   (467 words)

  
 References for Hadamard   (Site not responding. Last check: 2007-11-07)
M L Cartwright, Jacques Hadamard, Biographical Memoirs of Fellows of the Royal Society of London 2 (1965).
M L Cartwright, Jacques Hadamard, Biographical Memoirs of Fellows of the Royal Society 11 (1965), 75-98.
J-P Kahane, Jacques Hadamard, The Mathematical Intelligencer 13 (1) (1991), 23-29.
www-history.mcs.st-and.ac.uk /~history/References/Hadamard.html   (380 words)

  
 Jacques
Biography of Jacques Herbrand (1908-1931) Jacques Herbrand entered the École Normale Supérieure at the age of 17.
Biography of Jacques Hadamard (1865-1963) Jacques Hadamard's father, Amédée Hadamard, married Claire Marie Jeanne Picard on 6 June 1864.
Jacques and François Lurton - Producteurs de vin de par le monde ; Argentine, Australie, Chili, Espagne, France et Uruguay.
aliveinfo.com /?q=jacques   (688 words)

  
 Hadamard Matrix - Surch
It has been a common misapprehension over the last seven or eight years that the number of pairwise non-isomorphic 2-(23,11,5) designs is 1102.
This notion was first put forward by H. Kimura (New Hadamard matrix of order 24, Graphs Combin.
A Hadamard matrix is a matrix containing values -1 and +1 whose rows are orthogonal: i.e.
www.surch.co.uk /hadamard+matrix   (331 words)

  
 Abstract, Introduction and ToC: Hadamard matrices and their designs   (Site not responding. Last check: 2007-11-07)
We study these designs and hence Hadamard matrices with the tools of algebraic coding theory using the customary association of linear codes with designs.
The standard equivalence of Hadamard matrices is a refinement and, for example, the sixty 24 by 24 matrices fall into only six 2-equivalence classes.
Hadamard introduced these matrices because they were solutions to an extremal problem in analysis and they since have found applications in many non-combinatorial contexts.
www.lehigh.edu /efa0/public/www-data/hmanddtoc.html   (538 words)

  
 Jacques Hadamard Encyclopedia Article, Definition, History, Biography   (Site not responding. Last check: 2007-11-07)
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