<?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>S0035-001X2017000400351</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of the variational symmetries of the lagrangian on the propagator and associated conserved operators]]></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="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lechuga-Solís]]></surname>
<given-names><![CDATA[R.L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Puebla Instituto de Ciencias Departamento de Física Matemática]]></institution>
<addr-line><![CDATA[Puebla Pue.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Puebla Facultad de Ciencias Físico Matemáticas ]]></institution>
<addr-line><![CDATA[Puebla Pue.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<volume>63</volume>
<numero>4</numero>
<fpage>351</fpage>
<lpage>355</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2017000400351&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2017000400351&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2017000400351&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Making use of the expression for the propagator in terms of path integrals, we study the effect of certain variational symmetries of a Lagrangian on the corresponding propagator. We also show that by considering a point transformation that relates two different Lagrangians one can obtain a relation between the corresponding propagators.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Haciendo uso de la expresión para el propagador en términos de integrales de trayectoria, estudiamos el efecto de ciertas simetrías variacionales de una lagrangiana sobre el propagador correspondiente. Mostramos también que, considerando una transformación puntual que relaciona dos lagrangianas diferentes, se puede obtener una relación entre los propagadores correspondientes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Variational symmetries]]></kwd>
<kwd lng="en"><![CDATA[propagator]]></kwd>
<kwd lng="en"><![CDATA[path integral]]></kwd>
<kwd lng="en"><![CDATA[conserved operators]]></kwd>
<kwd lng="es"><![CDATA[Simetrías variacionales]]></kwd>
<kwd lng="es"><![CDATA[propagador]]></kwd>
<kwd lng="es"><![CDATA[integral de trayectoria]]></kwd>
<kwd lng="es"><![CDATA[operadores conservados]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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