<?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>S0034-74262011000100002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Regularidad de soluciones viscosas de una ecuación parabólica degenerada]]></article-title>
<article-title xml:lang="en"><![CDATA[Regularity of Viscose Solutions of a Degenerated Parabolic Equation]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ROMERO POLO]]></surname>
<given-names><![CDATA[PEDRO]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[RENDÓN ARBELÁEZ]]></surname>
<given-names><![CDATA[LEONARDO]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Magdalena  ]]></institution>
<addr-line><![CDATA[Santa Marta ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>15</day>
<month>06</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>15</day>
<month>06</month>
<year>2011</year>
</pub-date>
<volume>45</volume>
<numero>1</numero>
<fpage>19</fpage>
<lpage>30</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74262011000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74262011000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74262011000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En el presente trabajo se estudia el problema de Cauchy para cierta ecuación parabólica degenerada. Se obtiene la regularidad Hölder de las soluciones viscosas imponiendo condiciones al exponente m.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this paper we study the Cauchy problem for certain degenerated parabolic equation. We obtain the Hölder regularity of the viscose solutions imposing conditions over the exponent m.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Solución viscosa]]></kwd>
<kwd lng="es"><![CDATA[principio del máximo]]></kwd>
<kwd lng="es"><![CDATA[continuidad Hölder]]></kwd>
<kwd lng="en"><![CDATA[Viscose Solution]]></kwd>
<kwd lng="en"><![CDATA[Maximum Principle]]></kwd>
<kwd lng="en"><![CDATA[Hölder Continuity]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ 
<font size="2" face="verdana">

    <p>
<b>
<font size="4">
    <center>
Regularidad de soluciones viscosas de una ecuaci&oacute;n parab&oacute;lica degenerada
</center>
</font>
</b>
</p>

    <p>
<b>
<font size="3">
    <center>
Regularity of Viscose Solutions of a Degenerated Parabolic Equation
</center>
</font>
</b>
</p>

    <p>
    <center>
PEDRO ROMERO POLO<sup>1</sup>, 
LEONARDO REND&Oacute;N ARBEL&Aacute;EZ<sup>2</sup>
</center>
</p>

    <p>
<sup>1</sup>Universidad del Magdalena, Santa Marta, Colombia. Email: <a href="mailto:polopedro@gmail.com">polopedro@gmail.com</a>
    <br>

<sup>2</sup>Universidad Nacional de Colombia, Bogot&aacute;, Colombia. Email: <a href="mailto:lrendona@unal.edu.co">lrendona@unal.edu.co</a>
    <br>
</p>

<hr size="1">

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

    <p>
En el presente trabajo se estudia el problema de Cauchy para cierta ecuaci&oacute;n parab&oacute;lica degenerada. Se obtiene la regularidad H&ouml;lder de las soluciones viscosas imponiendo condiciones al exponente <i>m</i>.
</p>

    <p>
<b>
Palabras clave:
</b>
Soluci&oacute;n viscosa,
principio del m&aacute;ximo,
continuidad H&ouml;lder.
</p>

<hr size="1">

<i>2000 Mathematics Subject Classification: 35K55, 35K65.</i>

<hr size="1">

    <p>
<b>
    <center>
Abstract
</center>
</b>
</p>

    <p>
In this paper we study the Cauchy problem for certain degenerated parabolic equation. We obtain the H&ouml;lder regularity of the viscose solutions imposing conditions over the exponent <i>m</i>.
</p>

    <p>
<b>
Key words:
</b>
Viscose Solution,
Maximum Principle,
H&ouml;lder Continuity.
</p>

<hr size="1">

    <p>
Texto completo disponible en <a href="pdf/rcm/v45n1/v45n1a02.pdf">PDF</a>
</p>

<hr size="1">

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


    ]]></body>
<body><![CDATA[<!-- ref --><p>
[1] M. Bertsch, R. Dal Passo, and M. Ughi, `Discontinuous Viscosity Solutions of a Degenerate Parabolic Equation´, <i>Trans Amer. Math. Soc.</i> <i>320</i>, 2 (1990), 779-798.
&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=S0034-7426201100010000200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->

    <!-- ref --><p>
[2] M. Bertsch and M. Ughi, `Positivity Properties of Viscosity Solutions of a Denerate Parabolic Equation´, <i>Nonlinear Anal. TMA.</i> <i>14</i>, 7 (1990), 571-592. MR 92a:35006
&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=S0034-7426201100010000200002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->

    <!-- ref --><p>
[3] B. H. Gilding, `H&ouml;lder Continuity of Solutions of Parabolic Equations´, <i>J. Landon Math. Soc.,</i> <i>13</i>,  (1976), 103-106.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000027&pid=S0034-7426201100010000200003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->

    <!-- ref --><p>
[4] Y. G. Lu and L. Qian, `Regularity of Viscosity Solutions of a Degenerate Parabolic Equation´, <i>Proc. American Mathematical Society</i> <i>130</i>, 4 (2001), 999-1004.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000029&pid=S0034-7426201100010000200004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->

    <!-- ref --><p>
[5] M. Ughi, `Degenerate Parabolic Equation Modelling the Spread of an Epidemic´, <i>Ann. Mat. Pura Appl.</i> <i>143</i>,  (1986), 385-400. MR 88g:35105
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000031&pid=S0034-7426201100010000200005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->

    ]]></body>
<body><![CDATA[<center>
<b>(Recibido en abril de 2010. Aceptado en mayo de 2011)</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{RCMv45n1a02,    <br>
 &nbsp;&nbsp;&nbsp; AUTHOR &nbsp;= {Romero Polo, Pedro and Rend&oacute;n Arbel&aacute;ez, Leonardo},    <br>
 &nbsp;&nbsp;&nbsp; TITLE &nbsp; = {{Regularidad de soluciones viscosas de una ecuaci&oacute;n parab&oacute;lica degenerada}},    <br>
 &nbsp;&nbsp;&nbsp; JOURNAL = {Revista Colombiana de Matem&aacute;ticas},    <br>
&nbsp;&nbsp;&nbsp; YEAR &nbsp;&nbsp; = {2011},    <br>
&nbsp;&nbsp;&nbsp; volume &nbsp;= {45},    <br>
&nbsp;&nbsp;&nbsp; number &nbsp;= {1},    <br>
&nbsp;&nbsp;&nbsp; pages &nbsp; = {19-30}    <br>
}
</font></code>

<hr size="1">
</font>
    ]]></body>
<body><![CDATA[ ]]></body><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bertsch]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Dal Passo]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Ughi]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Discontinuous Viscosity Solutions of a Degenerate Parabolic Equation´]]></article-title>
<source><![CDATA[Trans Amer. Math. Soc.]]></source>
<year>1990</year>
<volume>320</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>779-798</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[Bertsch]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ughi]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Positivity Properties of Viscosity Solutions of a Denerate Parabolic Equation´]]></article-title>
<source><![CDATA[Nonlinear Anal. TMA.]]></source>
<year>1990</year>
<volume>14</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>571-592</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[Gilding]]></surname>
<given-names><![CDATA[B. H.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Hölder Continuity of Solutions of Parabolic Equations´]]></article-title>
<source><![CDATA[J. Landon Math. Soc.,]]></source>
<year>1976</year>
<volume>13</volume>
<page-range>103-106</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[Lu]]></surname>
<given-names><![CDATA[Y. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Qian]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Regularity of Viscosity Solutions of a Degenerate Parabolic Equation´]]></article-title>
<source><![CDATA[Proc. American Mathematical Society]]></source>
<year>2001</year>
<volume>130</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>999-1004</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ughi]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Degenerate Parabolic Equation Modelling the Spread of an Epidemic´]]></article-title>
<source><![CDATA[Ann. Mat. Pura Appl.]]></source>
<year>1986</year>
<volume>143</volume>
<page-range>385-400</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
