MAA Focus December 2010/January 2011 : Page 2

MAA FOCUS i s published by the Mathematical Association of America in February/March, April/May, June/July, August/ September, October/November, and December/January. Editor: Ivars Peterson, MAA ipeterson@maa.org Managing Editor: Lois M. Baron, MAA lbaron@maa.org Senior Writer: Harry Waldman, MAA hwaldman@maa.org Please address advertising inquiries to: advertising@maa.org President: David M. Bressoud First Vice President: Francis E. Su Second Vice President: Doug Ensley Secretary: Barbara T. Faires Treasurer: John W. Kenelly Executive Director: Tina H. Straley Director of Publications and Communications: Ivars Peterson MAA FOCUS Editorial Board: Donald J. Albers; Robert Bradley; Joseph Gallian; Jacque-line Giles; Colm Mulcahy; Michael Orrison; Peter Renz; Sharon Cutler Ross; Annie Selden; Hortensia Soto-Johnson; Peter Stanek; Ravi Vakil Letters to the editor should be addressed to Ivars Peterson, Mathematical Association of America, 1529 18th Street, NW, Washington, DC 20036, or by email to ipeterson@maa.org. Subscription and membership questions should be directed to the MAA Customer Service Center, 800-331-1622; email: maaservice@maa.org; 301-617-7800 (outside U.S. and Canada); fax: 301-206-9789. MAA Headquarters: 202-387-5200. Copyright © 2010, 2011 by the Mathematical Association of America (Incorporated). Educational institutions may reproduce articles for their own use, but not for sale, provided that the following citation is used: “Reprinted with permission of MAA FOCUS , the newsmagazine of the Mathematical Association of America.” Periodicals postage paid at Washington, D.C., and additional mailing offices. Postmaster: Send address changes to MAA FOCUS, Math-ematical Association of America, P.O. Box 90973, Washington, D.C. 20090-0973. ISSN: 0731-2040 Printed in the United States of America. MAA FOCUS 7 PMVNFt*TTVF      8 &#1a;        &#1a; 
 
 
 
 
   
 4QSFBEJOHUIF8PSEBCPVU.BSWFMPVT.BUIFNBUJDT By Ivars Peterson )FMMP&#0d;)PMPOPNZ By Katharine Merow .""5FOTPS(SBOU1SPHSBNT By Florence Fasanelli and Carole Lacampagne 3FUJSFE&#0e;&NFSJUVT.FNCFST.VTU$MBJN#FOFmUT /".3FQSFTFOUBUJWFBU$#.4$POGFSFODF&ODPVSBHFT%JWFSTJUZ MAA at SACNAS 8IJUF)PVTF4DJFODF'BJS*ODMVEFT*.08JOOFS .BUI%-8JOT(SBOUUP&YUFOE0OMJOF-JCSBSZ By Lang Moore $IBMMFOHFTBOE0QQPSUVOJUJFT By David Bressoud .BUI4FTTJPOT4DIFEVMFEBU
"""4.FFUJOH By Edward Aboufadel +..&#1b;-FBSOBCPVU0QUJPOTGPS(SBEVBUF3FTFBSDI By Ralucca Gera and Aaron Luttman )BSE2VFTUJPOTGPS.JEEMF4DIPPM.BUIFNBUJDT  By Steven R. Dunbar †TBNPOHUIF%BODJOH4BJOUT 1BVM&SEP By Gerald L. Alexanderson 5SVUIBOE#FBVUZ&#1b;"$PVSTFJO.BUIBOE-JUFSBUVSF By Marion Deutsche Cohen 1PFUSZ&#1b;8F)BWFBO"QQGPS5IBU By JoAnne Growney 1PTU FS&#0a;JOH.BUIFNBUJDTBTB#PPTUUP4DJFODF$BSFFST *NQMFNFOUJOHBO&GmDJFOU%FQBSUNFOUBM3FWJFX By Donna L. Beers, Nancy Baxter Hastings, and Kyle Riley .BLJOH:PVS.BUIFNBUJDT1SPHSBN7JCSBOU By Sandy Ganzell and David Kung 5FBDIJOH4UVEFOUT)PXUP4VSWJWF0SBM1SFTFOUBUJPOT By Gail Greene 5BLF"OPUIFS4IPUBU:PVS%PDVNFOU$BNFSB By Maria Andersen )JTUPSJDBM$PMMFDUJPOT/FFEUP(P%JHJUBM] By Carol Mead *OWBTJPOPGUIF10%#PPLT] By Fernando Q. Gouvêa #PPL3FWJFX] Networks | By Susan D’Agostino 35 Holiday Catalog ”s dancing among the saints is a sight to behold in San On the cover: Erdo Francisco. Read about it on page 16. Photo courtesy of Gerald L. Alexanderson.

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