<?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>S0034-74262010000200002</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Uniqueness of Conformal Metrics with Prescribed Scalar and mean Curvatures on Compact Manifolds with Boundary]]></article-title>
<article-title xml:lang="es"><![CDATA[Unicidad de métricas conformes con curvatura escalar y media prescritas sobre variedades compactas con frontera]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GARCÍA]]></surname>
<given-names><![CDATA[GONZALO]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MUÑOZ]]></surname>
<given-names><![CDATA[JHOVANNY]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Valle  ]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad del Valle  ]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>15</day>
<month>12</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>15</day>
<month>12</month>
<year>2010</year>
</pub-date>
<volume>44</volume>
<numero>2</numero>
<fpage>91</fpage>
<lpage>101</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74262010000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74262010000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74262010000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Let (Mn, g) be a compact manifold with boundary and n &ge; 2. In this paper we prove the variational characterization of the Neumann eigenvalues of an elliptic operator associated to the problem of conformal deformation of metrics and we study the uniqueness of metrics in the conformal class of the metric g having the same scalar curvature of the manifold and the same mean curvature of its boundary.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Sea (Mn, g) una variedad riemanniana compacta con frontera de dimensión n &ge; 2. En este artículo demostramos la caracterización variacional de los valores propios de Neumann de un operador elíptico asociado al problema de deformación conforme de métricas y estudiamos la unicidad de métricas en la clase conforme de la métrica g que tienen la misma curvatura escalar de la variedad y la misma curvatura media de su frontera.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Uniqueness]]></kwd>
<kwd lng="en"><![CDATA[Conformal metrics]]></kwd>
<kwd lng="en"><![CDATA[Curvature]]></kwd>
<kwd lng="es"><![CDATA[Unicidad]]></kwd>
<kwd lng="es"><![CDATA[métricas conformes]]></kwd>
<kwd lng="es"><![CDATA[curvatura]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ 
<font size="2" face="verdana">

    <p>
<b>
<font size="4">
    <center>
Uniqueness of Conformal Metrics with Prescribed Scalar and mean Curvatures on Compact Manifolds with Boundary
</center>
</font>
</b>
</p>

    <p>
<b>
<font size="3">
    <center>
Unicidad de m&eacute;tricas conformes con curvatura escalar y media prescritas sobre variedades compactas con frontera
</center>
</font>
</b>
</p>

    <p>
    <center>
GONZALO GARC&Iacute;A<sup>1</sup>, 
JHOVANNY MU&Ntilde;OZ<sup>2</sup>
</center>
</p>

    <p>
<sup>1</sup>Universidad del Valle, Cali, Colombia. Email: <a href="mailto:ggarcia@univalle.edu.co">ggarcia@univalle.edu.co</a>
    <br>

<sup>2</sup>Universidad del Valle, Cali, Colombia. Email: <a href="mailto:jhovamu@univalle.edu.co">jhovamu@univalle.edu.co</a>
    <br>
</p>

<hr size="1">

    ]]></body>
<body><![CDATA[<p>
<b>
    <center>
Abstract
</center>
</b>
</p>

    <p>
Let <i>(M<sup>n</sup>, g)</i> be a compact manifold with boundary and <i>n &ge; 2</i>. In this paper we prove the variational characterization of the Neumann eigenvalues of an elliptic operator associated to the problem of conformal deformation of metrics and we study the uniqueness of metrics in the conformal class of the metric <i>g</i> having the same scalar curvature of the manifold and the same mean curvature of its boundary.
</p>

    <p>
<b>
Key words:
</b>
Uniqueness,
Conformal metrics,
Curvature.
</p>

<hr size="1">

<i>2000 Mathematics Subject Classification: 53A30, 53C21, 58J32.</i>

<hr size="1">

    <p>
<b>
    <center>
Resumen
</center>
</b>
</p>

    <p>
Sea <i>(M<sup>n</sup>, g)</i> una variedad riemanniana compacta con frontera de dimensi&oacute;n <i>n &ge; 2</i>. En este art&iacute;culo demostramos la caracterizaci&oacute;n variacional de los valores propios de Neumann de un operador el&iacute;ptico asociado al problema de deformaci&oacute;n conforme de m&eacute;tricas y estudiamos la unicidad de m&eacute;tricas en la clase conforme de la m&eacute;trica <i>g</i> que tienen la misma curvatura escalar de la variedad y la misma curvatura media de su frontera.
</p>

    <p>
<b>
Palabras clave:
</b>
Unicidad,
m&eacute;tricas conformes,
curvatura.
</p>

<hr size="1">

    <p>
Texto completo disponible en <a href="pdf/rcm/v44n2/v44n2a02.pdf">PDF</a>
</p>

<hr size="1">

    <p>
<b>
<font size="3">
References
</font>
</b>
</p>


    ]]></body>
<body><![CDATA[<!-- ref --><p>
[1] Cherrier, `Probl&eacute;mes de Neumann non lin&eacute;aires sur vari&eacute;t&eacute;s riemanniennes´, <i>J. Funct. Anal</i> <i>57</i>,  (1984), 154-206.    &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=S0034-7426201000020000200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->
</p>

    <!-- ref --><p>
[2] J. F. Escobar, `Addendum: Conformal Deformation of a Riemannian Metric to a Scalar Flat Metric with Constant Mean Curvature´, <i>The Annals of Mathematics</i> <i>139</i>, 3 (1994), 749-750. Second Series
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000025&pid=S0034-7426201000020000200002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>
[3] J. F. Escobar, `Uniqueness and Non-Uniqueness of Metrics with Prescribed Scalar and Mean Curvature on Compact Manifolds with Boundary´, <i>J. of functional analysis</i> <i>202</i>,  (2003), 424-442.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000026&pid=S0034-7426201000020000200003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->
</p>

<hr size="1">

    <center>
<b>(Recibido en julio de 2009. Aceptado en agosto de 2010)</b>
</center>
<hr size="1">

    <p>
Este art&iacute;culo se puede citar en <i>LaTeX</i> utilizando la siguiente referencia bibliogr&aacute;fica de <i>BibTeX</i>:
</p>
<code><font size="2" face="verdana">
@ARTICLE{RCMv44n2a02,    <br>
 &nbsp;&nbsp;&nbsp; AUTHOR &nbsp;= {Garc&iacute;a, Gonzalo and Mu&ntilde;oz, Jhovanny},    <br>
 &nbsp;&nbsp;&nbsp; TITLE &nbsp; = {{Uniqueness of Conformal Metrics with Prescribed Scalar and mean Curvatures on Compact Manifolds with Boundary}},    <br>
 &nbsp;&nbsp;&nbsp; JOURNAL = {Revista Colombiana de Matem&aacute;ticas},    ]]></body>
<body><![CDATA[<br>
&nbsp;&nbsp;&nbsp; YEAR &nbsp;&nbsp; = {2010},    <br>
&nbsp;&nbsp;&nbsp; volume &nbsp;= {44},    <br>
&nbsp;&nbsp;&nbsp; number &nbsp;= {2},    <br>
&nbsp;&nbsp;&nbsp; pages &nbsp; = {91-101}    <br>
}
</font></code>

<hr size="1">
</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[Cherrier]]></surname>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Problémes de Neumann non linéaires sur variétés riemanniennes´]]></article-title>
<source><![CDATA[J. Funct. Anal]]></source>
<year>1984</year>
<volume>57</volume>
<page-range>154-206</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[Escobar]]></surname>
<given-names><![CDATA[J. F.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Addendum: Conformal Deformation of a Riemannian Metric to a Scalar Flat Metric with Constant Mean Curvature´]]></article-title>
<source><![CDATA[The Annals of Mathematics]]></source>
<year>1994</year>
<volume>139</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>749-750</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[Escobar]]></surname>
<given-names><![CDATA[J. F.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Uniqueness and Non-Uniqueness of Metrics with Prescribed Scalar and Mean Curvature on Compact Manifolds with Boundary´]]></article-title>
<source><![CDATA[J. of functional analysis]]></source>
<year>2003</year>
<volume>202</volume>
<page-range>424-442</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
