<?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>S0034-74262010000200007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[An Algebraic Characterization of Affine Manifolds with G-Structure Satisfying a Homogeneity Condition]]></article-title>
<article-title xml:lang="es"><![CDATA[Una caracterización algebraica de las variedades afines con G-estructura que satisfacen una condición de homogeneidad]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MARÍN]]></surname>
<given-names><![CDATA[CARLOS ALBERTO]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín ]]></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>149</fpage>
<lpage>165</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74262010000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74262010000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74262010000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[We give an algebraic characterization of the possible characteristic tensors of an infinitesimally homogeneous affine manifold with G-structure. Such concepts were introduced in [6].]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Presentamos una caracterización algebraica de los posibles tensores característicos de una variedad infinitesimalmente homogénea con G-estructura. Tales conceptos son introducidos en [6].]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Infinitesimally homogeneous manifold]]></kwd>
<kwd lng="en"><![CDATA[Inner torsion]]></kwd>
<kwd lng="en"><![CDATA[G-structures]]></kwd>
<kwd lng="es"><![CDATA[Variedad infinitesimalmente homogénea]]></kwd>
<kwd lng="es"><![CDATA[torsión interna]]></kwd>
<kwd lng="es"><![CDATA[G-estructuras]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ 
<font size="2" face="verdana">

    <p>
<b>
<font size="4">
    <center>
An Algebraic Characterization of Affine Manifolds with <i><b>G</b></i>-Structure Satisfying a Homogeneity Condition
</center>
</font>
</b>
</p>

    <p>
<b>
<font size="3">
    <center>
Una caracterizaci&oacute;n algebraica de las variedades afines con <i><b>G</b></i>-estructura que satisfacen una condici&oacute;n de homogeneidad
</center>
</font>
</b>
</p>

    <p>
    <center>
CARLOS ALBERTO MAR&Iacute;N<sup>1</sup>
</center>
</p>

    <p>
<sup>1</sup>Universidad de Antioquia, Medell&iacute;n, Colombia. Email: <a href="mailto:camara@matematicas.udea.edu.co">camara@matematicas.udea.edu.co</a>
    <br>
</p>

<hr size="1">

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

    <p>
We give an algebraic characterization of the possible characteristic tensors of an infinitesimally homogeneous affine manifold with <i>G</i>-structure. Such concepts were introduced in [6].
</p>

    <p>
<b>
Key words:
</b>
Infinitesimally homogeneous manifold,
Inner torsion,
<i>G</i>-structures.
</p>

<hr size="1">

<i>2000 Mathematics Subject Classification: 53A15, 53B05, 53C10, 53C30.</i>

<hr size="1">

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

    <p>
Presentamos una caracterizaci&oacute;n algebraica de los posibles tensores caracter&iacute;sticos de una variedad infinitesimalmente homog&eacute;nea con <i>G</i>-estructura. Tales conceptos son introducidos en [6].
</p>

    <p>
<b>
Palabras clave:
</b>
Variedad infinitesimalmente homog&eacute;nea,
torsi&oacute;n interna,
<i>G</i>-estructuras.
</p>

<hr size="1">

    <p>
Texto completo disponible en <a href="pdf/rcm/v44n2/v44n2a07.pdf">PDF</a>
</p>

<hr size="1">

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


    <!-- ref --><p>
[1] M. Dajczer, <i>Submanifolds and Isometric Immersions</i>, Publish or Perish, Houston, United States, 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=000022&pid=S0034-7426201000020000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->
</p>

    <!-- ref --><p>
[2] B. Daniel, `Isometric Immersions into <i>3</i>-Dimensional Homogeneous Manifolds´, <i>Comment. Math. Helv.</i> <i>82</i>, 1 (2007), 87-131.    &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=S0034-7426201000020000700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->
</p>

    <!-- ref --><p>
[3] B. Daniel, `Isometric Immersions into <i><b>S</b><sup>n</sup>\times<b>R</b></i> and <i><b>H</b><sup>n</sup>\times<b>R</b></i> and Applications to Minimal Surfaces´, <i>Trans. Am. Math. Soc.</i> <i>361</i>, 12 (2009), 6255-6282.    &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=S0034-7426201000020000700003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->
</p>

    <!-- ref --><p>
[4] S. Helgason, <i>Differential Geometry, Lie Groups, and Symmetric Spaces</i>, Academic press, New York, United States, 1978.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000028&pid=S0034-7426201000020000700004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->
</p>

    <!-- ref --><p>
[5] P. Piccione and D. Tausk, <i>The Theory of Connections and <i>G</i>-Structures: Applications to Affine and Isometric Immersions</i>, IMPA, Rio de Janeiro, Brazil, 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=000030&pid=S0034-7426201000020000700005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->
</p>

    <!-- ref --><p>
[6] P. Piccione and D. Tausk, `An Existence Theorem for <i>G</i>-Structure Preserving Affine Immersions´, <i>Indiana Univ. Math. J</i> <i>57</i>, 3 (2008), 1431-1465.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000032&pid=S0034-7426201000020000700006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->
</p>

<hr size="1">

    <center>
<b>(Recibido en septiembre de 2010. Aceptado en octubre 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{RCMv44n2a07,    <br>
 &nbsp;&nbsp;&nbsp; AUTHOR &nbsp;= {Mar&iacute;n, Carlos Alberto},    <br>
 &nbsp;&nbsp;&nbsp; TITLE &nbsp; = {{An Algebraic Characterization of Affine Manifolds with \boldsymbol{G}-Structure Satisfying a Homogeneity Condition}},    <br>
 &nbsp;&nbsp;&nbsp; JOURNAL = {Revista Colombiana de Matem&aacute;ticas},    <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; = {149-165}    ]]></body>
<body><![CDATA[<br>
}
</font></code>

<hr size="1">
</font>
     ]]></body><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dajczer]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Submanifolds and Isometric Immersions]]></source>
<year>1990</year>
<publisher-loc><![CDATA[Houston ]]></publisher-loc>
<publisher-name><![CDATA[Publish or Perish]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Daniel]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Isometric Immersions into 3-Dimensional Homogeneous Manifolds´]]></article-title>
<source><![CDATA[Comment. Math. Helv.]]></source>
<year>2007</year>
<volume>82</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>87-131</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[Daniel]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Isometric Immersions into Sn\timesR and Hn\timesR and Applications to Minimal Surfaces´]]></article-title>
<source><![CDATA[Trans. Am. Math. Soc.]]></source>
<year>2009</year>
<volume>361</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>6255-6282</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Helgason]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Differential Geometry, Lie Groups, and Symmetric Spaces]]></source>
<year>1978</year>
<publisher-loc><![CDATA[New York ]]></publisher-loc>
<publisher-name><![CDATA[Academic press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Piccione]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Tausk]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Theory of Connections and G-Structures: Applications to Affine and Isometric Immersions]]></source>
<year>2006</year>
<publisher-loc><![CDATA[Rio de Janeiro ]]></publisher-loc>
<publisher-name><![CDATA[IMPA]]></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[Piccione]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Tausk]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`An Existence Theorem for G-Structure Preserving Affine Immersions´]]></article-title>
<source><![CDATA[Indiana Univ. Math. J]]></source>
<year>2008</year>
<volume>57</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>1431-1465</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
