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</o:shapelayout></xml><![endif]--></head><body lang=ES-TRAD link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><div><div><div><div><p align=center style='text-align:center'><span lang=ES style='font-size:11.0pt;font-family:Consolas'>El Instituto Argentino de Matemática “Alberto P. Calderón” tiene el agrado de invitarlos al <b>Seminario de Análisis Funcional "Mischa Cotlar"</b></span><b><span style='font-size:11.0pt;font-family:Consolas'><o:p></o:p></span></b></p><p align=center style='text-align:center'><span lang=ES style='font-size:11.0pt;font-family:Consolas'>que se realizará el día viernes 3 de junio de 2011 a las 14 hs. en el Salón del Instituto.</span><span style='font-size:11.0pt;font-family:Consolas'><o:p></o:p></span></p><p align=center style='text-align:center'><span lang=ES style='font-size:11.0pt;font-family:Consolas'>Expondrá Alejandro Varela (UNGS-IAM</span><span style='font-size:11.0pt;font-family:Consol
as'>)</span><span lang=ES style='font-size:11.0pt;font-family:Consolas'>: <o:p></o:p></span></p><p align=center style='text-align:center'><b><span lang=ES style='font-size:11.0pt;font-family:Consolas'>“</span></b><b><span style='font-size:11.0pt;font-family:Consolas'>Testigos de mejores aproximantes de subálgebras de un álgebra C*” <o:p></o:p></span></b></p><p align=center style='text-align:center'><b><span style='font-size:11.0pt;font-family:Consolas'><o:p> </o:p></span></b></p></div></div></div></div><p><span style='font-size:11.0pt;font-family:Consolas'>Resumen: <o:p></o:p></span></p><p><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Dada una subálgebra C* B de un álgebra C* A, se dice que un elemento c de B es un mejor aproximante del elemento a de A si ||a-c|| es menor o igual a ||a-b|| para todo b de B. Un testigo de un mejor aproximante es un funcional que permite detectar si c es un mejor aproximante para a. Relacionaremos resu
ltados del artículo de M. Rieffel (<a href="http://xxx.lanl.gov/pdf/1008.3733"><span style='color:windowtext'>http://xxx.lanl.gov/pdf/1008.3733</span></a>) que estudia el tema con resultados propios (<a href="http://lanl.arxiv.org/pdf/1104.3841"><span style='color:windowtext'>http://lanl.arxiv.org/pdf/1104.3841</span></a>).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'>Cecilia Farias<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'>Instituto Argentino de Matemática "Alberto Calderón"<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'>Saavedra 15 3º piso<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'>(C1083ACA) Buenos Aires<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'>Argentina<o
:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'>Tel./Fax: (54) 11 4954-6781/2 int. 101.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'><a href="mailto:seciam@conicet.gov.ar">seciam@conicet.gov.ar</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'><a href="http://www.iam.conicet.gov.ar/">www.iam.conicet.gov.ar</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p></div></body></html>