<?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>S0034-74262012000200001</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[On Conjugacy Classes of \\SL(2,q)]]></article-title>
<article-title xml:lang="es"><![CDATA[Sobre las clases conjugadas de \\SL(2,q)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ADAN-BANTE]]></surname>
<given-names><![CDATA[EDITH]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[HARRIS]]></surname>
<given-names><![CDATA[JOHN M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,University of Saint Thomas  ]]></institution>
<addr-line><![CDATA[Minnesota ]]></addr-line>
<country>USA</country>
</aff>
<aff id="A02">
<institution><![CDATA[,University of Southern Mississippi  ]]></institution>
<addr-line><![CDATA[Mississippi ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>15</day>
<month>12</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>15</day>
<month>12</month>
<year>2012</year>
</pub-date>
<volume>46</volume>
<numero>2</numero>
<fpage>97</fpage>
<lpage>111</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74262012000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74262012000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74262012000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Let \SL(2,q) be the group of 2\times 2 matrices with determinant one over a finite field F of size q. We prove that if q is even, then the product of any two noncentral conjugacy classes of \SL(2,q) is the union of at least q-1 distinct conjugacy classes of \SL(2,q). On the other hand, if q>3 is odd, then the product of any two noncentral conjugacy classes of \SL(2,q) is the union of at least \fracq+32 distinct conjugacy classes of \SL(2,q).]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Sea \SL(2,q) el grupo de las matrices 2\times 2 con determinante uno sobre un campo finito F de tamaño q. Se prueba que si q es par, entonces el producto de cualesquiera dos clases conjugadas no centrales de \SL(2,q) es la unión de al menos q-1 distintas clases conjugadas de \SL(2,q). Por otro lado, si q>3 es impar, entonces el producto de cualesquiera dos clases conjugadas no centrales de \SL(2,q) es la unión de al menos \fracq+32 distintas clases conjugadas de \SL(2,q).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Conjugacy classes]]></kwd>
<kwd lng="en"><![CDATA[Matrices over a finite field]]></kwd>
<kwd lng="en"><![CDATA[Products of conjugacy classes]]></kwd>
<kwd lng="en"><![CDATA[Special linear group]]></kwd>
<kwd lng="es"><![CDATA[Clases conjugadas]]></kwd>
<kwd lng="es"><![CDATA[matrices sobre un campo finito]]></kwd>
<kwd lng="es"><![CDATA[producto de clases conjugadas]]></kwd>
<kwd lng="es"><![CDATA[grupo especial lineal]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="verdana">      <p> <b> <font size="4">     <center> On Conjugacy Classes of <i><b>\\SL(2,q)</b></i> </center> </font> </b> </p>      <p> <b> <font size="3">     <center> Sobre las clases conjugadas de <i><b>\\SL(2,q)</b></i> </center> </font> </b> </p>      <p>     <center> EDITH ADAN-BANTE<sup>1</sup>,  JOHN M. HARRIS<sup>2</sup> </center> </p>      <p> <sup>1</sup>University of Saint Thomas, Minnesota, USA. Email: <a href="mailto:EdithAdan@illinoisalumni.org">EdithAdan@illinoisalumni.org</a>     <br>  <sup>2</sup>University of Southern Mississippi, Mississippi, USA. Email: <a href="mailto:john.m.harris@usm.edu">john.m.harris@usm.edu</a>     <br> </p>  <hr size="1">      ]]></body>
<body><![CDATA[<p> <b>     <center> Abstract </center> </b> </p>      <p> Let <i>\SL(2,q)</i> be the group of <i>2\times 2</i> matrices with determinant one over a finite field <i>F</i> of size <i>q</i>. We prove that if <i>q</i> is even, then the product of any two noncentral conjugacy classes of <i>\SL(2,q)</i> is the union of at least <i>q-1</i> distinct conjugacy classes of <i>\SL(2,q)</i>. On the other hand, if <i>q&gt;3</i> is odd, then the product of any two noncentral conjugacy classes of <i>\SL(2,q)</i> is the union of at least <i>\fracq+32</i> distinct conjugacy classes of <i>\SL(2,q)</i>. </p>      <p> <b> Key words: </b> Conjugacy classes, Matrices over a finite field, Products of conjugacy classes, Special linear group. </p>  <hr size="1">  <i>2000 Mathematics Subject Classification: 15A33, 20E45, 20G40.</i>  <hr size="1">      <p> <b>     <center> Resumen </center> </b> </p>      <p> Sea <i>\SL(2,q)</i> el grupo de las matrices <i>2\times 2</i> con determinante uno sobre un campo finito <i>F</i> de tama&ntilde;o <i>q</i>. Se prueba que si <i>q</i> es par, entonces el producto de cualesquiera dos clases conjugadas no centrales de <i>\SL(2,q)</i> es la uni&oacute;n de al menos <i>q-1</i> distintas clases conjugadas de <i>\SL(2,q)</i>. Por otro lado, si <i>q&gt;3</i> es impar, entonces el producto de cualesquiera dos clases conjugadas no centrales de <i>\SL(2,q)</i> es la uni&oacute;n de al menos <i>\fracq+32</i> distintas clases conjugadas de <i>\SL(2,q)</i>. </p>      <p> <b> Palabras clave: </b> Clases conjugadas, matrices sobre un campo finito, producto de clases conjugadas, grupo especial lineal. </p>  <hr size="1">      <p> Texto completo disponible en <a href="pdf/rcm/v46n2/v46n2a01.pdf">PDF</a> </p>  <hr size="1">      <p> <b> <font size="3"> References </font> </b> </p>       ]]></body>
<body><![CDATA[<!-- ref --><p> &#91;1&#93; E. Adan-Bante, J. Harris, and H. Verril, Products of Conjugacy Classes of the Alternating Group,  preprint,    &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=S0034-7426201200020000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> 0000. </p>      <!-- ref --><p> &#91;2&#93; E. Adan-Bante and H. Verrill, 'Symmetric Groups and Conjugacy Classes', <i>J. Group Theory</i> <i>11</i>, 3 (2008), 371-379.    &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=S0034-7426201200020000100002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;3&#93; Z. Arad and M. Herzog, <i>Products of Conjugacy Classes in Groups</i>, Vol. 1112 of <i>Lecture notes in mathematics</i>, Springer-Verlag,    &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=S0034-7426201200020000100003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> 1985. </p>      <!-- ref --><p> &#91;4&#93; R. Gow, 'Commutators in Finite Simple Groups of Lie Type', <i>Bull. London Math. Soc.</i> <i>32</i>,  (2000), 311-315.    &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=S0034-7426201200020000100004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;5&#93; T. G. Group, <i>GAP - Groups, Algorithms, and Programming, Version 4.4.10</i>, (2007). http://www.gap-system.    &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=S0034-7426201200020000100005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->org </p>      ]]></body>
<body><![CDATA[<!-- ref --><p> &#91;6&#93; G. James and M. Liebeck, <i>Representations and Characters of Groups</i>, Cambridge mathematical textbooks, Cambridge University Press,    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000033&pid=S0034-7426201200020000100006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> 2001. </p>  <hr size="1">      <center> <b>(Recibido en agosto de 2011. Aceptado en noviembre de 2012)</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{RCMv46n2a01,    <br>  &nbsp;&nbsp;&nbsp; AUTHOR &nbsp;= {Adan-Bante, Edith and Harris, John M.},    <br>  &nbsp;&nbsp;&nbsp; TITLE &nbsp; = {{On Conjugacy Classes of \boldsymbol{\SL(2,q)}}},    <br>  &nbsp;&nbsp;&nbsp; JOURNAL = {Revista Colombiana de Matem&aacute;ticas},    <br> &nbsp;&nbsp;&nbsp; YEAR &nbsp;&nbsp; = {2012},    <br> &nbsp;&nbsp;&nbsp; volume &nbsp;= {46},    <br> &nbsp;&nbsp;&nbsp; number &nbsp;= {2},    ]]></body>
<body><![CDATA[<br> &nbsp;&nbsp;&nbsp; pages &nbsp; = {97--111}    <br> } </font></code>  <hr size="1"> </font>      ]]></body><back>
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