<?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>S0035-001X2002000100013</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Mathieu functions revisited: matrix evaluation and generating functions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chaos-Cador]]></surname>
<given-names><![CDATA[L.]]></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>
</contrib>
</contrib-group>
<aff id="A01">
<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>00</month>
<year>2002</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<volume>48</volume>
<numero>1</numero>
<fpage>67</fpage>
<lpage>75</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2002000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2002000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2002000100013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[An updated didactical approach to Mathieu functions is presented as an alternative to the orthodox treatment. The matrix evaluation of the angular Mathieu functions is not only pertinent, but long over due, after seventy five years of matrix quantum mechanics and with the availability of computing tools. Plane waves are identified as generating functions of the Mathieu functions, showing their explicit expansions. Some mathematical and physical applications are illustrated.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se presenta un enfoque actualizado y didáctico para las funciones de Mathieu como una alternativa a la presentación ortodoxa. La evaluación matricial de las funciones de Mathieu angulares es no solamente pertinente sino retrasada después de setenta y cinco años de mecánica cuántica matricial y con la disponibilidad de herramientas computacionales. Se identifican las ondas planas como funciones generadoras de las funciones de Mathieu, mostrando sus desarrollos explícitos. Se ilustran algunas aplicaciones matemáticas y físicas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Mathieu functions]]></kwd>
<kwd lng="en"><![CDATA[matrix evaluation]]></kwd>
<kwd lng="en"><![CDATA[generating functions]]></kwd>
<kwd lng="es"><![CDATA[Funciones de Mathieu]]></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"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Mathieu functions revisited: matrix evaluation and generating functions</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>L. Chaos&#45;Cador<sup>1</sup> and E. Ley&#45;Koo<sup>2</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Instituto de F&iacute;sica, Universidad Nacional Aut&oacute;noma de M&eacute;xico. Apartado postal 20&#45;364, 01000 M&eacute;xico, D.F., M&eacute;xico.</i> e&#45;mail: <sup>1</sup> <a href="mailto:lorea@fisica.unam.mx">lorea@fisica.unam.mx</a>, <sup>2</sup> <a href="mailto:eleykoo@fisica.unam.mx">eleykoo@fisica.unam.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 24 de octubre de 2001.    ]]></body>
<body><![CDATA[<br> 	Aceptado el 13 de noviembre de 2001.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">An updated didactical approach to Mathieu functions is presented as an alternative to the orthodox treatment. The matrix evaluation of the angular Mathieu functions is not only pertinent, but long over due, after seventy five years of matrix quantum mechanics and with the availability of computing tools. Plane waves are identified as generating functions of the Mathieu functions, showing their explicit expansions. Some mathematical and physical applications are illustrated.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Mathieu functions; matrix evaluation; generating functions.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></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 enfoque actualizado y did&aacute;ctico para las funciones de Mathieu como una alternativa a la presentaci&oacute;n ortodoxa. La evaluaci&oacute;n matricial de las funciones de Mathieu angulares es no solamente pertinente sino retrasada despu&eacute;s de setenta y cinco a&ntilde;os de mec&aacute;nica cu&aacute;ntica matricial y con la disponibilidad de herramientas computacionales. Se identifican las ondas planas como funciones generadoras de las funciones de Mathieu, mostrando sus desarrollos expl&iacute;citos. Se ilustran algunas aplicaciones matem&aacute;ticas y f&iacute;sicas.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Funciones de Mathieu; evaluaci&oacute;n matricial; funciones generadoras.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 02.30.Jr; 02.30.Hq; 02.30.Gp</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v48n1/v48n1a13.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. E. Mathieu, <i>J. Math. 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