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Mathematics People Mathematics People information, sometimes even one incorrect bit can de- Chudnovsky and Spielman stroy the integrity of the data stream; adding verification Selected as MacArthur Fellows ‘codes’ to the data helps to test its accuracy. Spielman and collaborators developed several families of codes Maria Chudnovsky of Columbia University and Dan- that optimize speed and reliability, some approaching the iel Spielman of Yale University have been named Mac- theoretical limit of performance. One, an enhanced version Arthur Fellows for 2012. Each Fellow receives a grant of of low-density parity checking, is now used to broadcast US$500,000 in support, with no strings attached, over the and decode high-definition television transmissions. In a next five years. separate line of research, Spielman resolved an enduring Chudnovsky was honored for her work on the classifica- mystery of computer science: why a venerable algorithm tions and properties of graphs. The prize citation reads, for optimization (e.g., to compute the fastest route to the “Maria Chudnovsky is a mathematician who investigates airport, picking up three friends along the way) usually the fundamental principles of graph theory. In mathemat- works better in practice than theory would predict. He and ics, a graph is an abstraction that represents a set of similar a collaborator proved that small amounts of randomness things and the connections between them—e.g., cities and convert worst-case conditions into problems that can be the roads connecting them, networks of friendship among solved much faster. This finding holds enormous practi- people, websites and their links to other sites. When used cal implications for a myriad of calculations in science, to solve real-world problems, like efficient scheduling for engineering, social science, business, and statistics that an airline or package delivery service, graphs are usually depend on the simplex algorithm or its derivatives. Most so complex that it is not possible to determine whether recently, Spielman has championed the application of testing all the possibilities individually will find the best linear algebra to solve optimization problems in graph solution in a practical time period. Chudnovsky explores theory. He and his colleagues have offered a new approach classifications and properties of graphs that can serve as to maximizing the flow through unidirectional graphs, shortcuts to brute-force methods; showing that a specific promising significant improvements in the speed of a graph belongs to a certain class often implies that it can wide range of applications, such as scheduling, operating be calculated relatively quickly. In an early breakthrough, system design, and DNA sequence analysis. Through these Chudnovsky and colleagues proved a conjecture offered projects and fundamental insights into a host of other in the early 1960s, known as the ‘Strong Perfect Graph areas, such as complexity theory and spectral theory, Theorem’, that identifies specific criteria required for a Spielman is connecting theoretical and applied computer graph to fall into the ‘perfect’ class. Any perfect graph science in both intellectually and socially profound ways.” can be colored efficiently (i.e., no node is connected to another node of the same color), and graph coloring bears Maria Chudnovsky received her B.A. (1996) and M.Sc. a direct relation to finding efficient solutions to problems (1999) degrees from Technion, Israel Institute of Technol- such as allocating noninterfering radio frequencies in com- ogy, and an M.A. (2002) and a Ph.D. (2003) from Princeton munication networks. Since this landmark accomplish- University. She was affiliated with Princeton University ment, Chudnovsky has continued to generate a series of from 2003 to 2006 and was a research fellow at the Clay important results in graph theory. Although her research Mathematics Institute from 2003 to 2008. At Columbia is highly abstract, she is laying the conceptual foundations she is currently an associate professor in the Department for deepening the connections between graph theory and of Industrial Engineering and Operations Research, with a other major branches of mathematics, such as linear pro- courtesy appointment in the Department of Mathematics. gramming, geometry, and complexity theory.” Daniel Spielman received his B.A. (1992) from Yale Spielman was honored for his work connecting theo- University and his Ph.D. (1995) from the Massachusetts retical and applied computing to resolve issues in code Institute of Technology. He was affiliated with the Mas- optimization theory, with implications for how we mea- sachusetts Institute of Technology from 1996 to 2005. At sure, predict, and regulate our environment and behavior. Yale University he is currently Henry Ford II Professor of The prize citation reads, “Daniel Spielman is a theoretical Computer Science, Mathematics, and Applied Mathematics computer scientist studying abstract questions that none- in the Department of Computer Science. theless affect the essential aspects of daily life in modern The MacArthur Fellows Program awards unrestricted society—how we communicate and how we measure, fellowships to talented individuals who have shown ex- predict, and regulate our environment and our behavior. traordinary originality and dedication in their creative Spielman’s early research pursued aspects of coding pursuits and a marked capacity for self-direction. There theory, the mathematical basis for ensuring the reliability are three criteria for selection of Fellows: exceptional cre- of electronic communications. When transferring digital ativity, promise for important future advances based on a 100 NOTICES OF THE AMS VOLUME 60, NUMBER 1 Mathematics People track record of significant accomplishment, and potential awarded the 2012 George Szekeres Medal for outstanding for the fellowship to facilitate subsequent creative work. contributions to the mathematical sciences in the fifteen years prior to the year of the award. Akshay Venkatesh of Stanford University has been —From a MacArthur Foundation announcement awarded the Mahler Lectureship for 2013. The lectureship is awarded every two years to a distinguished mathema- Levin Awarded Knuth Prize tician who preferably works in an area of mathematics associated with the work of Kurt Mahler. Leonid Levin of Boston University has been awarded the Imam Tashdid ul Alam of the Australian National 2012 Knuth Prize “for his visionary research in complexity, University received the Bernhard Neumann Prize for an cryptography, and information theory, including the dis- outstanding talk presented by a student at the annual covery of NP-completeness.” Working in the Soviet Union meeting of the Australian Mathematical Society. at the same time as Stephen Cook in the United States, The Australia and New Zealand Industrial and Applied Levin made his discovery of NP-completeness, the core Mathematics Division (ANZIAM) has awarded its ANZIAM concept of computational complexity. He also developed Medal to Robert McKibbin of Massey University for out- the theory of “average-case NP-completeness” for prob- standing achievement in applied and industrial mathemat- lems considered intractable on average. He has also done ics in Australia, and Matthew Simpson of Queensland significant work on the PCP theorem, the cornerstone of University received the ANZIAM J. H. Michell Medal for the theory of computational hardness of approximation, outstanding new researchers. and in cryptography theory. The Knuth Prize, named in honor of Donald Knuth of —From Australian Mathematical Society announcements Stanford University, is given every eighteen months by the Association for Computing Machinery (ACM) Special Inter- est Group on Algorithms and Computation Theory (SIGACT) and the Institute of Electrical and Electronics Engineers AAAS Elects New Members (IEEE) Technical Committee on the Mathematical Founda- The American Academy of Arts and Sciences (AAAS) has tions of Computing. It carries a cash award of US$5,000. chosen 202 new fellows and 17 foreign honorary mem- bers for 2012. Following are the names and affiliations of —From an ACM announcement the new members who work in the mathematical sciences or whose work involves considerable mathematics: Parimala Awarded Noether Bonnie Berger, Massachusetts Institute of Technology; Joan S. L. Birman, Barnard College, Columbia University; Lectureship Russel E. Caflisch, University of California Los Angeles; Raman Parimala of Emory University has been named Thomas M. Liggett, University of California Los Angeles; the 2013 Noether Lecturer by the Association for Women Bao Chˆau Ngˆo, University of Chicago; Judea Pearl, Uni- in Mathematics (AWM). She was honored “for her fun- versity of California Los Angeles; Bjorn M. Poonen, Mas- damental work in algebra and algebraic geometry with sachusetts Institute of Technology; Steven H. Strogatz, significant contributions to the study of quadratic Cornell University; and Richard L. Taylor, Institute for forms, hermitian forms, linear algebraic groups and Advanced Study. Elected as a foreign honorary member Galois cohomology.” She will deliver the lecture at the was Louis Boutet de Monvel, Université Pierre et Marie 2013 Joint Mathematics Meetings. The Noether Lecture- Curie, Paris, France. ship honors women who have made fundamental and sustained contributions to the mathematical sciences. —From an AAAS announcement —From an AWM announcement Royal Society of Canada Australian Mathematical Elections
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