<?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>S0035-001X2015000400004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The Liouville theorem as a problem of common eigenfunctions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres del Castillo]]></surname>
<given-names><![CDATA[G.F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma de Puebla Instituto de Ciencias Departamento de Física Matemática]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<volume>61</volume>
<numero>4</numero>
<fpage>268</fpage>
<lpage>271</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2015000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2015000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2015000400004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[It is shown that, by appropriately defining the eigenfunctions of a function defined on the extended phase space, the Liouville theorem on solutions of the Hamilton-Jacobi equation can be formulated as the problem of finding common eigenfunctions of n constants of motion in involution, where n is the number of degrees of freedom of the system.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se muestra que, definiendo apropiadamente las eigenfunciones de una función definida en el espacio fase extendido, el teorema de Liouville sobre las soluciones de la ecuación de Hamilton-Jacobi puede formularse como el problema de hallar eigenfunciones comunes de n constantes de movimiento en involución, donde n es el número de grados de libertad del sistema.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Hamilton-Jacobi equation]]></kwd>
<kwd lng="en"><![CDATA[Liouville theorem]]></kwd>
<kwd lng="en"><![CDATA[eigenfunctions]]></kwd>
<kwd lng="es"><![CDATA[Ecuación de Hamilton-Jacobi]]></kwd>
<kwd lng="es"><![CDATA[teorema de Liouville]]></kwd>
<kwd lng="es"><![CDATA[eigenfunciones]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>  	    <p align="center"><font face="verdana" size="4">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>The Liouville theorem as a problem of common eigenfunctions</b></font></p>     <p align="center"><font face="verdana" size="4">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>G.F. Torres del Castillo</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>      <p align="justify"><font face="verdana" size="2"><i>Departamento de F&iacute;sica Matem&aacute;tica, Instituto de Ciencias, Universidad Aut&oacute;noma de Puebla, 72570 Puebla, Pue., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>      <p align="justify"><font face="verdana" size="2">Received 6 April 2015.    ]]></body>
<body><![CDATA[<br> Accepted 11 May 2015.</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">It is shown that, by appropriately defining the eigenfunctions of a function defined on the extended phase space, the Liouville theorem on solutions of the Hamilton&#45;Jacobi equation can be formulated as the problem of finding common eigenfunctions of <i>n</i> constants of motion in involution, where <i>n</i> is the number of degrees of freedom of the system.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Hamilton&#45;Jacobi equation; Liouville theorem; eigenfunctions.</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 muestra que, definiendo apropiadamente las eigenfunciones de una funci&oacute;n definida en el espacio fase extendido, el teorema de Liouville sobre las soluciones de la ecuaci&oacute;n de Hamilton&#45;Jacobi puede formularse como el problema de hallar eigenfunciones comunes de <i>n</i> constantes de movimiento en involuci&oacute;n, donde <i>n</i> es el n&uacute;mero de grados de libertad del sistema.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Ecuaci&oacute;n de Hamilton&#45;Jacobi; teorema de Liouville; eigenfunciones.</font></p> 	    <p align="justify"><font face="verdana" size="2"> PACS: 45.20.Jj; 02.30.Jr</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>      <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v61n4/v61n4a4.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. T. Whittaker, <i>A Treatise on the Analytical Dynamics of Particles and Rigid Bodies,</i> 4th ed. (Cambridge University Press, Cambridge, 1993).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8404262&pid=S0035-001X201500040000400001&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. G. Vilasi, <i>Hamiltonian Dynamics</i> (World Scientific, Singapore, 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=8404264&pid=S0035-001X201500040000400002&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. O. Babelon, D. Bernard, and M. Talon, <i>Introduction to Classical Integrable Systems</i> (Cambridge University Press, Cambridge, 2003).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8404266&pid=S0035-001X201500040000400003&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. A. Fasano and S. Marmi, <i>Analytical Mechanics</i> (Oxford University Press, Oxford, 2006).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8404268&pid=S0035-001X201500040000400004&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. E. Di Benedetto, <i>Classical Mechanics</i> (Birkh&auml;user, New York, 2011).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8404270&pid=S0035-001X201500040000400005&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. G.F. Torres del Castillo, <i>Rev. Mex. Fis.</i> <b>57</b> (2011) 245.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8404272&pid=S0035-001X201500040000400006&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. I.N. Sneddon, <i>Elements of Partial Differential Equations</i> (Dover, New York, 2006).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8404274&pid=S0035-001X201500040000400007&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. G.F. Torres del Castillo, H. H. Cruz Dom&iacute;nguez, A. de Yta Hern&aacute;ndez, J. E. Herrera Flores, and A. Sierra Mart&iacute;nez, <i>Rev. Mex. Fis.</i> <b>60</b> (2014) 301.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8404276&pid=S0035-001X201500040000400008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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