<?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>S0034-74262016000100007</article-id>
<article-id pub-id-type="doi">10.15446/recolma.v50n1.62205</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Operator-valued Fourier multipliers on toroidal Besov spaces]]></article-title>
<article-title xml:lang="es"><![CDATA[Multiplicadores de Fourier operador-valuados sobre espacios de Besov toroidales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barraza Martínez]]></surname>
<given-names><![CDATA[Bienvenido]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Martínez]]></surname>
<given-names><![CDATA[Iván]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Monzón]]></surname>
<given-names><![CDATA[Jairo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Norte  ]]></institution>
<addr-line><![CDATA[Barranquilla ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A">
<institution><![CDATA[,idgonzalez@uninorte.edu.co  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A">
<institution><![CDATA[,jahernan@uninorte.edu.co  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2016</year>
</pub-date>
<volume>50</volume>
<numero>1</numero>
<fpage>109</fpage>
<lpage>137</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74262016000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74262016000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74262016000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We prove in this paper that a sequence M: Zn &#8594; L(E) of bounded variation is a Fourier multiplier on the Besov space Bs p, q(Tn, E) for s &#8712; R, 1 < p < &#8734;, 1 &#8804; q &#8804; 1 and E a Banach space, if and only if E is a UMD-space. This extends the Theorem 4.2 in &#91;3&#93; to the n-dimensional case. As illustration of the applicability of this results we study the solvability of two abstract Cauchy problems with periodic boundary conditions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En el presente artículo se prueba que una sucesión M: Zn &#8594; L(E) de variación acotada, es un multiplicador de Fourier sobre el espacio de Besov Bs p, q(Tn, E) para s &#8712; R, 1 < p < &#8734;, 1 &#8804; q &#8804; 1 y E un espacio de Banach, si y solo si, E es un espacio UMD. Este resultado extiende el Teorema 4.2 en &#91;3&#93; al caso n-dimensional. Como ilustración de la aplicabilidad de este resultado, se estudia la solubilidad de dos problemas de Cauchy abstractos con condiciones de frontera periódicas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Fourier multipliers]]></kwd>
<kwd lng="en"><![CDATA[operator-valued symbols]]></kwd>
<kwd lng="en"><![CDATA[UMD-spaces]]></kwd>
<kwd lng="en"><![CDATA[toroidal Besov spaces]]></kwd>
<kwd lng="es"><![CDATA[Multiplicadores de Fourier]]></kwd>
<kwd lng="es"><![CDATA[símbolos operador-valuados]]></kwd>
<kwd lng="es"><![CDATA[espacios UMD]]></kwd>
<kwd lng="es"><![CDATA[espacios de Besov toroidales]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font face="Verdana" size="2">     <p>DOI: <a href="https://doi.org/10.15446/recolma.v50n1.62205" target="_blank">https://doi.org/10.15446/recolma.v50n1.62205</a></p>      <p align="center"><font size="4"><b>Operator-valued Fourier multipliers on toroidal Besov spaces</b></font></p>      <p align="center"><font size="3"><b>Multiplicadores de Fourier operador-valuados sobre espacios de Besov toroidales</b></font></p>      <p align="center">Bienvenido Barraza Mart&iacute;nez, Iv&aacute;n Gonz&aacute;lez Mart&iacute;nez, Jairo Hern&aacute;ndez Monz&oacute;n<sup>1</sup></p>      <p><sup>1</sup> Universidad del Norte, Barranquilla, Colombia. <a href="mailto:bbarraza@uninorte.edu.co"><u>bbarraza@uninorte.edu.co</u></a>, <a href="mailto:idgonzalez@uninorte.edu.co"><u>idgonzalez@uninorte.edu.co</u></a>, <a href="mailto:jahernan@uninorte.edu.co"><u>jahernan@uninorte.edu.co</u></a></p>  <hr>      <p align="center"><b>Abstract</b></p>      <p>We prove in this paper that a sequence <i>M</i>: <font face="Castellar">Z</font><sup><i>n</i></sup> &rarr; <font face="Monotype Corsiva">L</font>(<i>E</i>) of bounded variation is a Fourier multiplier on the Besov space <i>B<sup>s</sup><sub>p, q</sub></i>(<font face="Castellar">T</font><sup><i>n</i></sup>, <i>E</i>) for <i>s</i> &isin; <font face="Castellar">R</font>, 1 &lt; <i>p</i> &lt; &infin;, 1 &le; <i>q</i> &le; 1 and <i>E</i> a Banach space, if and only if <i>E</i> is a UMD-space. This extends the Theorem 4.2 in &#91;3&#93; to the <i>n</i>-dimensional case. As illustration of the applicability of this results we study the solvability of two abstract Cauchy problems with periodic boundary conditions.</p>      <p><b>Keywords</b>: Fourier multipliers, operator-valued symbols, UMD-spaces, toroidal Besov spaces.</p>  <hr>     <p><i>2010 Mathematics Subject Classification:</i> 42A45, 47A56.</p>  <hr>     ]]></body>
<body><![CDATA[<p align="center"><b>Resumen</b></p>      <p>En el presente art&iacute;culo se prueba que una sucesi&oacute;n <i>M</i>: <font face="Castellar">Z</font><sup><i>n</i></sup> &rarr; <font face="Monotype Corsiva">L</font>(<i>E</i>) de variaci&oacute;n acotada, es un multiplicador de Fourier sobre el espacio de Besov <i>B<sup>s</sup><sub>p, q</sub></i>(<font face="Castellar">T</font><sup><i>n</i></sup>, <i>E</i>) para <i>s</i> &isin; <font face="Castellar">R</font>, 1 &lt; <i>p</i> &lt; &infin;, 1 &le; <i>q</i> &le; 1 y <i>E</i> un espacio de Banach, si y solo si, <i>E</i> es un espacio UMD. Este resultado extiende el Teorema 4.2 en &#91;3&#93; al caso <i>n</i>-dimensional. Como ilustraci&oacute;n de la aplicabilidad de este resultado, se estudia la solubilidad de dos problemas de Cauchy abstractos con condiciones de frontera peri&oacute;dicas.</p>      <p><b>Palabras claves</b>: Multiplicadores de Fourier, s&iacute;mbolos operador-valuados, espacios UMD, espacios de Besov toroidales.</p>  <hr>      <p>Texto completo disponible en <a href="pdf/rcm/v50n1/v50n1a07.pdf" target="_blank">PDF</a></p> <hr>      <p align="center"><b>References</b></p>      <!-- ref --><p>&#91;1&#93; H. Amann, Elliptic operators with dimensional state spaces, J. Evo. Equ. 1 (2001), 143-188.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2664983&pid=S0034-7426201600010000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>&#91;2&#93; W. Arendt, M. Beil, F. Fleischer, S. L&uuml;ck, S. 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