<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2002000300016</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Spheroidal functions revisited: matrix evaluation and generating functions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aquino]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castaño]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ley-Koo]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma Metropolitana Departamento de Física ]]></institution>
<addr-line><![CDATA[Iztapalapa Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Física ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2002</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2002</year>
</pub-date>
<volume>48</volume>
<numero>3</numero>
<fpage>277</fpage>
<lpage>282</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2002000300016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2002000300016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2002000300016&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[A matrix method to evaluate the angular spheroidal functions is presented as an alternative to the orthodox method.Plane waves are identified as generating functions of the spheroidal functions showing their explicit expansions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se presenta un método matricial para evaluar las funciones esferoidales angulares como alternativa al método ortodoxo. Se identifican las ondas planas como funciones generadoras de las funciones esferoidales, mostrando sus desarrollos explícitos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Spheroidal functions]]></kwd>
<kwd lng="en"><![CDATA[matrix evaluation]]></kwd>
<kwd lng="en"><![CDATA[generating functions]]></kwd>
<kwd lng="es"><![CDATA[Funciones esferoidales]]></kwd>
<kwd lng="es"><![CDATA[evaluación matricial]]></kwd>
<kwd lng="es"><![CDATA[funciones generadoras]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Ense&ntilde;anza</font></p>     <p align="justify">&nbsp;</p>   	    <p align="center"><font face="verdana" size="4"><b>Spheroidal functions revisited: matrix evaluation and generating functions</b></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font face="verdana" size="2"><b>N. Aquino<sup>1</sup> and E. Casta&ntilde;o<sup>1</sup>, E. Ley&#45;Koo<sup>2</sup></b></font></p>                  <p align="justify">&nbsp;</p>        <p align="justify"><font face="verdana" size="2"><sup>1</sup> <i>Departamento de F&iacute;sica, Universidad Aut&oacute;noma Metropolitana&#45;Iztapalapa Apartado Postal 55&#45;534, 09340, M&eacute;xico, D.F., M&eacute;xico.</i></font></p>            <p align="justify"><font face="verdana" size="2"><sup>2</sup> <i>Instituto de F&iacute;sica&#45;UNAM. Apartado Postal 20&#45;364, 01000 M&eacute;xico, D. F.</i> <i>M&eacute;xico.</i> e&#45;mail: <a href="mailto:eleykoo@fisica.unam.mx">eleykoo@fisica.unam.mx</a></font></p>         <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2">Recibido el 07 de noviembre de 2001.     ]]></body>
<body><![CDATA[<br>    Aceptado el 22 de marzo de 2002.</font></p>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>      <p align="justify"><font face="verdana" size="2">A matrix method to evaluate the angular spheroidal functions is presented as an alternative to the orthodox method.Plane waves are identified as generating functions of the spheroidal functions showing their explicit expansions.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Spheroidal functions; matrix evaluation; generating functions.</font></p>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>      <p align="justify"><font face="verdana" size="2">Se presenta un m&eacute;todo matricial para evaluar las funciones esferoidales angulares como alternativa al m&eacute;todo ortodoxo. Se identifican las ondas planas como funciones generadoras de las funciones esferoidales, mostrando sus desarrollos expl&iacute;citos.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Funciones esferoidales; evaluaci&oacute;n matricial; funciones generadoras.</font></p>      <p align="justify"><font face="verdana" size="2">PACS: 02.30.Jr, 02.30.Hq, 02.30.Gp</font></p>      ]]></body>
<body><![CDATA[<p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v48n3/v48n3a16.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">1. L.Chaos&#45;Cador and E. Ley&#45;Koo, <i>Rev. Mex. Fis.,</i> 40 (2002) 67.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8286643&pid=S0035-001X200200030001600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">2. M. Abramowitz and I. A. Stegun, <i>Handbook</i> <i>of</i> <i>Mathematical Functions</i> (Dover, New York, 1965).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8286645&pid=S0035-001X200200030001600002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">3. J. A. Stratton, P. M. Morse, L. J. Chu and R. A. Hutner, <i>Elliptic cylinder and spheroidal wave functions</i> (Wiley, New York, 1941).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8286647&pid=S0035-001X200200030001600003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">4. P. M. Morse and H. Feshbach, <i>Methods</i> <i>of</i> <i>Theoretical Physics</i> (McGraw Hill, New York, 1953).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8286649&pid=S0035-001X200200030001600004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">5. J. Meixner and F. W. Sch&auml;fke, <i>Mathieusche Funktionen und Spharoidfunktionen</i> (Springer Verlach, Berlin, 1954).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8286651&pid=S0035-001X200200030001600005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">6. J. A. Stratton, P. M. Morse, L. J. Chu, D. C. Little and F. J. Corbat&oacute;, <i>Spheroidal wave functions</i> (Wiley, New York, 1956).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8286653&pid=S0035-001X200200030001600006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">7. C. Flammer, <i>Spheroidal wave functions</i> (Stanford Univ. Press, 1957).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8286655&pid=S0035-001X200200030001600007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">8. L. Chaos&#45;Cador y E. Ley&#45;Koo, "Atomo y ion molecular de hidrogeno bidimensionales confinados en elipses", XLIV Congreso Nacional de F&iacute;sica, 1SE3 (2001).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8286657&pid=S0035-001X200200030001600008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body>
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