<?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>1870-3542</journal-id>
<journal-title><![CDATA[Revista mexicana de física E]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fís. E]]></abbrev-journal-title>
<issn>1870-3542</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-35422008000200019</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Comment on "Continuous groups of transformations and time-dependent invariants"]]></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 Pue]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>54</volume>
<numero>2</numero>
<fpage>240</fpage>
<lpage>241</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-35422008000200019&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-35422008000200019&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-35422008000200019&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Some errors in a recent paper (Rev. Mex. Fis. E 53 (2007) 112) dealing with the Noether theorem are pointed out]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se señalan algunos errores en un artículo reciente (Rev. Mex. Fís. E 53 (2007) 112) relacionado con el teorema de Noether]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Noether's theorem]]></kwd>
<kwd lng="en"><![CDATA[Lagrangian]]></kwd>
<kwd lng="en"><![CDATA[continuous symmetries]]></kwd>
<kwd lng="es"><![CDATA[Teorema de Noether]]></kwd>
<kwd lng="es"><![CDATA[lagrangiana]]></kwd>
<kwd lng="es"><![CDATA[simetrías continuas]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Comentarios</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Comment on "Continuous groups of transformations and time&#150;dependent invariants"</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>G.F. Torres del Castillo</b></font></p>     <p align="justify"><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">Recibido el 30 de julio de 2007    <br> Aceptado el 5 de agosto de 2008</font></p>     ]]></body>
<body><![CDATA[<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">Some errors in a recent paper <i>(Rev. Mex. Fis. E </i><b>53</b> (2007) 112) dealing with the Noether theorem are pointed out.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Noether's theorem; Lagrangian; continuous symmetries.</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 se&ntilde;alan algunos errores en un art&iacute;culo reciente <i>(Rev. Mex. F&iacute;s. E </i><b>53</b> (2007) 112) relacionado con el teorema de Noether.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Teorema de Noether; lagrangiana; simetr&iacute;as continuas.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 45.20.Jj; 02.20.Qs</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/rmfe/v54n2/v54n2a19.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. A.L. Gelover&#150;Santiago and M.G. Corona&#150;Galindo, <i>Rev. Mex. Fis. </i>E <b>53</b> (2007) 112.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8449928&pid=S1870-3542200800020001900001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2. H. Stephani, <i>Differential equations: their solution using symmetries </i>(Cambridge University Press, Cambridge, 1989).</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8449929&pid=S1870-3542200800020001900002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> ]]></body><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gelover-Santiago]]></surname>
<given-names><![CDATA[A.L]]></given-names>
</name>
<name>
<surname><![CDATA[Corona-Galindo]]></surname>
<given-names><![CDATA[M.G]]></given-names>
</name>
</person-group>
<source><![CDATA[Rev. Mex. Fis. E]]></source>
<year>2007</year>
<numero>53</numero>
<issue>53</issue>
<page-range>112</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stephani]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[Differential equations: their solution using symmetries]]></source>
<year>1989</year>
<publisher-loc><![CDATA[Cambridge ]]></publisher-loc>
<publisher-name><![CDATA[Cambridge University Press]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
