<?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>S0034-74262014000100007</article-id>
<article-id pub-id-type="doi">10.15446/recolma.v48n1.45198</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Generalized Rigid Modules]]></article-title>
<article-title xml:lang="es"><![CDATA[Módulos generalizados rígidos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GUNER]]></surname>
<given-names><![CDATA[ERDAL]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[HALICIOGLU]]></surname>
<given-names><![CDATA[SAIT]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Ankara University  ]]></institution>
<addr-line><![CDATA[Ankara ]]></addr-line>
<country>Turkey</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Ankara University  ]]></institution>
<addr-line><![CDATA[Ankara ]]></addr-line>
<country>Turkey</country>
</aff>
<pub-date pub-type="pub">
<day>15</day>
<month>06</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>15</day>
<month>06</month>
<year>2014</year>
</pub-date>
<volume>48</volume>
<numero>1</numero>
<fpage>111</fpage>
<lpage>123</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74262014000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74262014000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74262014000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Let &alpha; be an endomorphism of an arbitrary ring R with identity. The aim of this paper is to introduce the notion of an &alpha;-rigid module which is an extension of the rigid property in rings and the &alpha;-reduced property in modules defined in &#91;8&#93;. The class of &alpha;-rigid modules is a new kind of modules which behave like rigid rings. A right R-module M is called \alpha-rigid if ma &alpha;(a)=0 implies ma=0 for any m &isin; M and a &isin; R. We investigate some properties of &alpha;-rigid modules and among others we also prove that if M&#91;x;&alpha;&#93; is a reduced right R&#91;x;&alpha;&#93;-module, then M is an &alpha;-rigid right R-module. The ring R is &alpha;-rigid if and only if every flat right R-module is &alpha;-rigid. For a rigid right R-module M, M is &alpha;-semicommutative if and only if M&#91;x;&alpha;&#93;R&#91;x;\,\alpha&#93; is semicommutative if and only if M\big&#91;&#91;x;&alpha;&#93;\big&#93;R&#91;&#91;x;\,\alpha&#93;&#93; is semicommutative.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Sea &alpha; un endomorfismo de un anillo arbitrario R con identidad. El propósito de este articulo es introducir la noción de un módulo &alpha;-rígido el cual es una extensión de la propiedad de rigidez en anillos y la propiedad de &alpha;-reducibilidad en módulos definida en &#91;8&#93;. La clase de módulos &alpha;-rígidos es una nueva clase de módulos los cuales de comportan como anillos rígidos. Un R-módulo derecho M es llamado \alpha-rígido si ma &alpha;(a)=0 implica que ma=0 para cualquier m &isin; M y a &isin; R. Nosotros investigamos algunas propiedades de módulos &alpha;-rígidos y entre otras nosotros también probamos que si M&#91;x;&alpha;&#93; es un R&#91;x;&alpha;&#93;-módulo derecho reducido, entonces M es un R-módulo derecho &alpha;-rígido. El anillo R es &alpha;-rígido si y sólo si cada R-módulo bandera derecha es &alpha;-rígido. Para un R-módulo derecho rígido M, M es &alpha;-semiconmutativo si y sólo si M&#91;x;&alpha;&#93;R&#91;x;\,\alpha&#93; es semiconmutativo si y sólo si M\big&#91;&#91;x;&alpha;&#93;\big&#93;R&#91;&#91;x;\,\alpha&#93;&#93; es semiconmutativo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Reduced modules]]></kwd>
<kwd lng="en"><![CDATA[Semicommutative modules]]></kwd>
<kwd lng="en"><![CDATA[Armendariz modules]]></kwd>
<kwd lng="en"><![CDATA[Rigid modules]]></kwd>
<kwd lng="es"><![CDATA[Módulos reducidos]]></kwd>
<kwd lng="es"><![CDATA[módulos semiconmutativos]]></kwd>
<kwd lng="es"><![CDATA[módulos de Armendariz]]></kwd>
<kwd lng="es"><![CDATA[módulos rigidos]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="verdana">     <p><a href="http://dx.doi.org/10.15446/recolma.v48n1.45198" target="_blank">http://dx.doi.org/10.15446/recolma.v48n1.45198</a></p>     <p> <b> <font size="4">     <center> Generalized Rigid Modules </center> </font> </b> </p>      <p> <b> <font size="3">     <center> M&oacute;dulos generalizados r&iacute;gidos </center> </font> </b> </p>      <p>     <center> ERDAL GUNER<sup>1</sup>,  SAIT HALICIOGLU<sup>2</sup> </center> </p>      <p> <sup>1</sup>Ankara University, Ankara, Turkey. Email: <a href="mailto:guner@science.ankara.edu.tr">guner@science.ankara.edu.tr</a>     <br>  <sup>2</sup>Ankara University, Ankara, Turkey. Email: <a href="mailto:halici@ankara.edu.tr">halici@ankara.edu.tr</a>     ]]></body>
<body><![CDATA[<br> </p>  <hr size="1">      <p> <b>     <center> Abstract </center> </b> </p>      <p> Let <i>&alpha;</i> be an endomorphism of an arbitrary ring <i>R</i> with identity. The aim of this paper is to introduce the notion of an <i>&alpha;</i>-rigid module which is an extension of the rigid property in rings and the <i>&alpha;</i>-reduced property in modules defined in &#91;8&#93;. The class of <i>&alpha;</i>-rigid modules is a new kind of modules which behave like rigid rings. A right <i>R</i>-module <i>M</i> is called <em>\alpha-rigid</em> if <i>ma &alpha;(a)=0</i> implies <i>ma=0</i> for any <i>m &isin; M</i> and <i>a &isin; R</i>. We investigate some properties of <i>&alpha;</i>-rigid modules and among others we also prove that if <i>M&#91;x;&alpha;&#93;</i> is a reduced right <i>R&#91;x;&alpha;&#93;</i>-module, then <i>M</i> is an <i>&alpha;</i>-rigid right <i>R</i>-module. The ring <i>R</i> is <i>&alpha;</i>-rigid if and only if every flat right <i>R</i>-module is <i>&alpha;</i>-rigid. For a rigid right <i>R</i>-module <i>M</i>, <i>M</i> is <i>&alpha;</i>-semicommutative if and only if <i>M&#91;x;&alpha;&#93;<sub>R&#91;x;\,\alpha&#93;</sub></i> is semicommutative if and only if <i>M\big&#91;&#91;x;&alpha;&#93;\big&#93;<sub>R&#91;&#91;x;\,\alpha&#93;&#93;</sub></i> is semicommutative. </p>      <p> <b> Key words: </b> Reduced modules, Semicommutative modules, Armendariz modules, Rigid modules. </p>  <hr size="1">  <i>2000 Mathematics Subject Classification: 16U80, 16S36.</i>  <hr size="1">      <p> <b>     <center> Resumen </center> </b> </p>      <p> Sea <i>&alpha;</i> un endomorfismo de un anillo arbitrario <i>R</i> con identidad. El prop&oacute;sito de este articulo es introducir la noci&oacute;n de un m&oacute;dulo <i>&alpha;</i>-r&iacute;gido el cual es una extensi&oacute;n de la propiedad de rigidez en anillos y la propiedad de <i>&alpha;</i>-reducibilidad en m&oacute;dulos definida en &#91;8&#93;. La clase de m&oacute;dulos <i>&alpha;</i>-r&iacute;gidos es una nueva clase de m&oacute;dulos los cuales de comportan como anillos r&iacute;gidos. Un <i>R</i>-m&oacute;dulo derecho <i>M</i> es llamado <em>\alpha-r&iacute;gido</em> si <i>ma &alpha;(a)=0</i> implica que <i>ma=0</i> para cualquier <i>m &isin; M</i> y <i>a &isin; R</i>. Nosotros investigamos algunas propiedades de m&oacute;dulos <i>&alpha;</i>-r&iacute;gidos y entre otras nosotros tambi&eacute;n probamos que si <i>M&#91;x;&alpha;&#93;</i> es un <i>R&#91;x;&alpha;&#93;</i>-m&oacute;dulo derecho reducido, entonces <i>M</i> es un <i>R</i>-m&oacute;dulo derecho <i>&alpha;</i>-r&iacute;gido. El anillo <i>R</i> es <i>&alpha;</i>-r&iacute;gido si y s&oacute;lo si cada <i>R</i>-m&oacute;dulo bandera derecha es <i>&alpha;</i>-r&iacute;gido. Para un <i>R</i>-m&oacute;dulo derecho r&iacute;gido <i>M</i>, <i>M</i> es <i>&alpha;</i>-semiconmutativo si y s&oacute;lo si <i>M&#91;x;&alpha;&#93;<sub>R&#91;x;\,\alpha&#93;</sub></i> es semiconmutativo si y s&oacute;lo si <i>M\big&#91;&#91;x;&alpha;&#93;\big&#93;<sub>R&#91;&#91;x;\,\alpha&#93;&#93;</sub></i> es semiconmutativo. </p>      <p> <b> Palabras clave: </b> M&oacute;dulos reducidos, m&oacute;dulos semiconmutativos, m&oacute;dulos de Armendariz, m&oacute;dulos rigidos. </p>  <hr size="1">      <p> Texto completo disponible en <a href="pdf/rcm/v48n1/v48n1a07.pdf">PDF</a> </p>  <hr size="1">      ]]></body>
<body><![CDATA[<p> <b> <font size="3"> References </font> </b> </p>       <!-- ref --><p> &#91;1&#93; N. Agayev and A. Harmanci, 'On Semicommutative Modules and Rings', <i>Kyungpook Math. J.</i> <i>47</i>,  (2007), 21-30.    &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=S0034-7426201400010000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;2&#93; Y. Hirano, 'On the Uniqueness of Rings of Coefficients in Skew Polynomial Rings', <i>Publ. Math. Debrecen</i> <i>54</i>,  (1999), 489-495.    &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=S0034-7426201400010000700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;3&#93; C. Y. Hong, N. K. Kim, and T. K. Kwak, 'Ore Extensions of Baer and p.p.-Rings', <i>J. Pure and Appl. Algebra</i> <i>151</i>, 3 (2000), 215-226.    &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=S0034-7426201400010000700003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;4&#93; C. Y. Hong, N. K. Kim, and T. K. Kwak, 'On Skew Armendariz Rings', <i>Comm. Algebra</i> <i>31</i>,  (2003), 103-122.    &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=S0034-7426201400010000700004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;5&#93; C. Y. Hong, T. K. Kwak, and S. T. Rizvi, 'Extensions of Generalized Armendariz Rings', <i>Algebra Colloq.</i> <i>13</i>, 2 (2006), 253-266.    &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=S0034-7426201400010000700005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;6&#93; H. Kose, B. Ungor, and S. Halicioglu, 'A Generalization of Reduced Rings', <i>Hacet. J. Math. Stat.</i> <i>41</i>, 5 (2012), 689-696.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000034&pid=S0034-7426201400010000700006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;7&#93; J. Krempa, 'Some Examples of Reduced Rings', <i>Algebra Colloq.</i> <i>3</i>, 4 (1996), 289-300.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000036&pid=S0034-7426201400010000700007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;8&#93; T. K. Lee and Y. Zhou, Reduced Modules, 'Rings, Modules, Algebras, and Abelian Groups', (2004), Vol. 236, Lecture Notes in Pure and Appl. Math., Dekker, New York, p. 365-377.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000038&pid=S0034-7426201400010000700008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;9&#93; M. B. Rege and S. Chhawchharia, 'Armendariz Rings', <i>Proc. Japan Acad. Ser. A Math. Sci.</i> <i>73</i>,  (1997), 14-17.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000040&pid=S0034-7426201400010000700009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>      <!-- ref --><p> &#91;10&#93; J. J. Rotman, <i>An Introduction to Homological Algebra</i>, Second edn, Springer,    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000042&pid=S0034-7426201400010000700010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> 2009. </p>      <!-- ref --><p> &#91;11&#93; C. Zhang and J. Chen, '<i>&alpha;</i>-skew Armendariz Modules and <i>&alpha;</i>-Semicommutative Modules', <i>Taiwanese J. Math.</i> <i>12</i>, 2 (2008), 473-486.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000044&pid=S0034-7426201400010000700011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </p>  <hr size="1">      <center> <b>(Recibido en diciembre de 2013. Aceptado en marzo de 2014)</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{RCMv48n1a07,    <br>  &nbsp;&nbsp;&nbsp; AUTHOR &nbsp;= {Guner, Erdal and Halicioglu, Sait},    <br>  &nbsp;&nbsp;&nbsp; TITLE &nbsp; = {{Generalized Rigid Modules}},    <br>  &nbsp;&nbsp;&nbsp; JOURNAL = {Revista Colombiana de Matem&aacute;ticas},    <br> &nbsp;&nbsp;&nbsp; YEAR &nbsp;&nbsp; = {2014},    <br> &nbsp;&nbsp;&nbsp; volume &nbsp;= {48},    ]]></body>
<body><![CDATA[<br> &nbsp;&nbsp;&nbsp; number &nbsp;= {1},    <br> &nbsp;&nbsp;&nbsp; pages &nbsp; = {111--123}    <br> } </font></code>  <hr size="1"> </font>      ]]></body><back>
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