<?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>0034-7426</journal-id>
<journal-title><![CDATA[Revista Colombiana de Matemáticas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.colomb.mat.]]></abbrev-journal-title>
<issn>0034-7426</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia y Sociedad Colombiana de Matemáticas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-74262006000100001</article-id>
<title-group>
<article-title xml:lang="fr"><![CDATA[VARIANTES DU PRINCIPE VARIATIONNEL D'EKELAND ET APPLICATIONS]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[El Amrouss]]></surname>
<given-names><![CDATA[Abdel Rachid]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,UNIVERSITÉ MOHAMED I OUJDA, MAROC FACULTÉ DES SCIENCES DÉPARTEMENT DE MATHÉMATIQUES ET D'INFORMATIQUE]]></institution>
<addr-line><![CDATA[OUJDA ]]></addr-line>
<country>MAROC</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<volume>40</volume>
<numero>1</numero>
<fpage>1</fpage>
<lpage>14</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74262006000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74262006000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74262006000100001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this note, we establish a variant of Ekeland's variational principle. This result suggests a generalization of the classical Palais-Smale condition. An example is provided showing how this is used to give the existence of a minimizer for functionals which do not satisfy the Palais-Smale condition and the one introduced by Cerami. We also prove a relation between the coercitivity of functional and the introduced compactness condition.]]></p></abstract>
<abstract abstract-type="short" xml:lang="fr"><p><![CDATA[Dans cette note, nous établissons une variante du principe variationnel d'Ekeland. Ce résultat suggère d'introduire une généralisation de la condition de Palais-Smale classique. Un exemple montre comment ceci peut s'appliquer pour assurer l'existence d'un minimiseur pour des fonctions ne satisfaisent pas les conditions de Palais-Smale et de Cerami. Nous prouvons aussi une relation entre la coercivité de la fonction et la condition de compacité introduite.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Ekeland's principle variational]]></kwd>
<kwd lng="en"><![CDATA[Palais-Smale condition]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face=verdana>      <p> <font size="4">        <center>     <b>VARIANTES DU PRINCIPE VARIATIONNEL D'EKELAND ET APPLICATIONS</b>   </center>  </font> </p>     <p>&nbsp;</p>     <p>      <b> Abdel Rachid El Amrouss</b>  </p>      <p>      D&Eacute;PARTEMENT DE MATH&Eacute;MATIQUES ET D'INFORMATIQUE   FACULT&Eacute; DES SCIENCES   UNIVERSIT&Eacute; MOHAMED I   OUJDA, MAROC</p>      <p> e-mail: <a href="mailto:amrouss@sciences.univ-oujda.ac.ma">amrouss@sciences.univ-oujda.ac.ma</a>  </p>  <hr size="1">     <p><b> ABSTRACT.</b> In this note, we establish a variant of Ekeland's variational    principle. This result suggests a generalization of the classical Palais-Smale    condition. An example is provided showing how this is used to give the existence    of a minimizer for functionals which do not satisfy the Palais-Smale condition    and the one introduced by Cerami. We also prove a relation between the coercitivity    of functional and the introduced compactness condition.</p>     <p> <b><i>Keywords and phrases</i>.</b> Ekeland's principle variational, Palais-Smale    condition. </p>     <p><i>2000 Mathematics Subject Classi&macr;cation.</i> Primary : 58E05, 35J65.    Secondary : 49B27.</p>   <hr size="1">     ]]></body>
<body><![CDATA[<p> <b>R&Eacute;SUM&Eacute;</b>. Dans cette note,    nous &eacute;tablissons une variante du principe variationnel d'Ekeland. Ce    r&eacute;sultat sugg&egrave;re d'introduire une g&eacute;n&eacute;ralisation    de la condition de Palais-Smale classique. Un exemple montre comment ceci peut    s'appliquer pour assurer l'existence d'un minimiseur pour des fonctions ne satisfaisent    pas les conditions de Palais-Smale et de Cerami. Nous prouvons aussi une relation    entre la coercivit&eacute; de la fonction et la condition de compacit&eacute;    introduite. </p>    <hr size="2">     <p>TEXTO COMPLETO EN <a href="pdf/rcm/v40n1/v40n1a01.pdf">PDF</a></p>   <hr size="2">       <br>     <p>    <center><b>R&Eacute;F&Eacute;RENCES</b></center></p>    <br>        <!-- ref --><p>&#91;1] H. Brezis &amp; L. Nirenberg, Remarks on fnding critical points, <i>Comm</i>.    <i>Pure Appl. Math.</i>, <b>64</b> (1991) 939-963. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000019&pid=S0034-7426200600010000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;2] L. Caklovic, S. J. Li &amp; M. Willem, A note on Palais-Smale condition    and coercivity, <i>Diff. Int. Eqn.</i>, <b>3</b> (1990) 799-800. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000020&pid=S0034-7426200600010000100002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;3] G. Cerami, Un criterio de esistenza per i punti critici su variet&aacute;    ilimitate, <i>Rc. Ist. Lomb. Sci. Lett</i>, <b>121</b> (1978) 332-336. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000021&pid=S0034-7426200600010000100003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;4] D. G. Costa &amp; eSilva Elves De B., The Palais-Smale condition versus    coer- civity, <i>Nonlinear Analysis</i>, <b>16</b> (1991) 371-381. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000022&pid=S0034-7426200600010000100004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;5] I. Ekeland, <i>Convexity methods in Hamiltonian mechanics</i>, Springer,    Berlin, 1990. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000023&pid=S0034-7426200600010000100005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;6] I. Ekeland, On the variational principle, <i>J. Math. Anal. Applic.</i>,    <b>47</b> (1974) 324-357. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000024&pid=S0034-7426200600010000100006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>(Recibido en abril de 2005. Aceptado en febrero de 2006) </p>        <br>   </font>       ]]></body><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Brezis]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Nirenberg]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Remarks on fnding critical points]]></article-title>
<source><![CDATA[Comm. Pure Appl. Math.]]></source>
<year>1991</year>
<volume>64</volume>
<page-range>939-963</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Caklovic]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[S. J]]></given-names>
</name>
<name>
<surname><![CDATA[Willem]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[A note on Palais-Smale condition and coercivity]]></article-title>
<source><![CDATA[Diff. Int. Eqn.]]></source>
<year>1990</year>
<volume>3</volume>
<page-range>799-800</page-range></nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cerami]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang="fr"><![CDATA[Un criterio de esistenza per i punti critici su varietá ilimitate]]></article-title>
<source><![CDATA[Rc. Ist. Lomb. Sci. Lett]]></source>
<year>1978</year>
<volume>121</volume>
<page-range>332-336</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Costa]]></surname>
<given-names><![CDATA[D. G]]></given-names>
</name>
<name>
<surname><![CDATA[Elves De B]]></surname>
<given-names><![CDATA[eSilva]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[The Palais-Smale condition versus coer- civity]]></article-title>
<source><![CDATA[Nonlinear Analysis]]></source>
<year>1991</year>
<volume>16</volume>
<page-range>371-381</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ekeland]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
</person-group>
<source><![CDATA[Convexity methods in Hamiltonian mechanics]]></source>
<year>1990</year>
<publisher-loc><![CDATA[Berlin ]]></publisher-loc>
<publisher-name><![CDATA[Springer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ekeland]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[On the variational principle]]></article-title>
<source><![CDATA[J. Math. Anal. Applic.]]></source>
<year>1974</year>
<volume>47</volume>
<page-range>324-357</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
