<?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>S0034-74262011000200001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Una nota sobre conjuntos de Sidon infinitos]]></article-title>
<article-title xml:lang="en"><![CDATA[A Remark on Infinite Sidon Sets]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MALDONADO LÓPEZ]]></surname>
<given-names><![CDATA[JUAN PABLO]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Université Pierre et Marie Curie  ]]></institution>
<addr-line><![CDATA[Paris ]]></addr-line>
<country>Francia</country>
</aff>
<pub-date pub-type="pub">
<day>15</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>15</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>45</volume>
<numero>2</numero>
<fpage>113</fpage>
<lpage>127</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74262011000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74262011000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74262011000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Un conjunto de Sidon es un subconjunto de los enteros con la propiedad que la suma de cada dos elementos es distinta. En 1998, I. Ruzsa dio una construcción probabilística de un conjunto de Sidon infinito cuya función de conteo es x\\sqrt2-1+o(1). En este trabajo mostramos una simplificación de dicha construcción.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[A Sidon set is a subset of the integers with the property that the sums of every two elements are distinct. In 1998, I. Ruzsa gave a probabilistic construction of an infinite Sidon set whose counting function is given by x\\sqrt2-1+o(1). In this work we simplify such a construction.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Conjuntos de Sidon]]></kwd>
<kwd lng="es"><![CDATA[teoría combinatoria de números]]></kwd>
<kwd lng="es"><![CDATA[primos gaussianos]]></kwd>
<kwd lng="en"><![CDATA[Sidon sets]]></kwd>
<kwd lng="en"><![CDATA[Additive number theory]]></kwd>
<kwd lng="en"><![CDATA[Gaussian primes]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="verdana">      <p> <b> <font size="4">     <center> Una nota sobre conjuntos de Sidon infinitos </center> </font> </b> </p>      <p> <b> <font size="3">     <center> A Remark on Infinite Sidon Sets </center> </font> </b> </p>      <p>     <center> JUAN PABLO MALDONADO L&Oacute;PEZ<sup>1</sup> </center> </p>      <p> <sup>1</sup>Universit&eacute; Pierre et Marie Curie, Paris, Francia. Email: <a href="mailto:maldonadolo@math.jussieu.fr">maldonadolo@math.jussieu.fr</a>     <br> </p>  <hr size="1">      <p> <b>     ]]></body>
<body><![CDATA[<center> Resumen </center> </b> </p>      <p> Un conjunto de Sidon es un subconjunto de los enteros con la propiedad que la suma de cada dos elementos es distinta. En 1998, I. Ruzsa dio una construcci&oacute;n probabil&iacute;stica de un conjunto de Sidon infinito cuya funci&oacute;n de conteo es <i>x<sup>\sqrt{2}-1+o(1)</sup></i>. En este trabajo mostramos una simplificaci&oacute;n de dicha construcci&oacute;n. </p>      <p> <b> Palabras clave: </b> Conjuntos de Sidon, teor&iacute;a combinatoria de n&uacute;meros, primos gaussianos. </p>  <hr size="1">  <i>2000 Mathematics Subject Classification: 11P21, 11B75.</i>  <hr size="1">      <p> <b>     <center> Abstract </center> </b> </p>      <p> A Sidon set is a subset of the integers with the property that the sums of every two elements are distinct. In 1998, I. Ruzsa gave a probabilistic construction of an infinite Sidon set whose counting function is given by <i>x<sup>\sqrt{2}-1+o(1)</sup></i>. In this work we simplify such a construction. </p>      <p> <b> Key words: </b> Sidon sets, Additive number theory, Gaussian primes. </p>  <hr size="1">      <p> Texto completo disponible en <a href="pdf/rcm/v45n2/v45n2a01.pdf">PDF</a> </p>  <hr size="1">      <p> <b> <font size="3"> Referencias </font> </b> </p>       <!-- ref --><p> &#91;1&#93; J. Cilleruelo and I. Ruzsa, 'Real and -padic sidon sequences', <i>Acta Sci. Math (Szeged)</i> <i>70</i>,  (2004), 505-510.    &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=S0034-7426201100020000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;2&#93; K. O'Bryant, 'A Complete Annotated Bibliography of Work Related to Sidon Sequences', <i>Electronic Journal of Combinatorics</i>,  (2004).    &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=S0034-7426201100020000100002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;3&#93; I. Ruzsa, 'An Infinite Sidon Set', <i>Journal of Number Theory</i>,  (1998), 63-71.    &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=S0034-7426201100020000100003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;4&#93; S. Sidon, 'Ein Satz &Uuml;ber Trigonometrische Polynome und Seine Anwendungen in der Theorie der Fourier-Reihen', <i>Math. Annalen</i> <i>106</i>,  (1932), 536-539.    &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=S0034-7426201100020000100004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>  <hr size="1">      <center> <b>(Recibido en junio de 2010. Aceptado en septiembre 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{RCMv45n2a01,    <br>  &nbsp;&nbsp;&nbsp; AUTHOR &nbsp;= {Maldonado L&oacute;pez, Juan Pablo},    ]]></body>
<body><![CDATA[<br>  &nbsp;&nbsp;&nbsp; TITLE &nbsp; = {{Una nota sobre conjuntos de Sidon infinitos}},    <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;= {2},    <br> &nbsp;&nbsp;&nbsp; pages &nbsp; = {113--127}    <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[Cilleruelo]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Ruzsa]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA['Real and -padic sidon sequences']]></article-title>
<source><![CDATA[Acta Sci. Math (Szeged)]]></source>
<year>2004</year>
<volume>70</volume>
<page-range>505-510</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[O'Bryant]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA['A Complete Annotated Bibliography of Work Related to Sidon Sequences']]></article-title>
<source><![CDATA[Electronic Journal of Combinatorics]]></source>
<year>2004</year>
</nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ruzsa]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA['An Infinite Sidon Set']]></article-title>
<source><![CDATA[Journal of Number Theory]]></source>
<year>1998</year>
<page-range>63-71</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[Sidon]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang="ge"><![CDATA['Ein Satz Über Trigonometrische Polynome und Seine Anwendungen in der Theorie der Fourier-Reihen']]></article-title>
<source><![CDATA[Math. Annalen]]></source>
<year>1932</year>
<volume>106</volume>
<page-range>536-539</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
