<?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>S0034-74262005000100005</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Free k-cyclic E-lattices over a poset]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monteiro]]></surname>
<given-names><![CDATA[Luiz F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Figallo]]></surname>
<given-names><![CDATA[Aldo V.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional del Sur Instituto de Matemática de Bahía Blanca ]]></institution>
<addr-line><![CDATA[Bahía Blanca ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional del Sur  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2005</year>
</pub-date>
<volume>39</volume>
<numero>1</numero>
<fpage>57</fpage>
<lpage>61</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74262005000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74262005000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74262005000100005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this note we consider a new equational class of algebras called E-lattices (A, &#094;, V, h, 0, 1) where (A, &#094;, V, 0, 1) is a distributive (0,1)-lattice and h is a lattice endomorphism. We consider the subclass Ek of k-cyclic E-lattices such that h k(x) = x, for all x, k is a positive integer. We determine the structure of the free k-cyclic E-lattice over a poset using results obtained by L. Monteiro in [9[ for the free distributive lattice over a poset.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este artículo consideramos una nueva clase ecuacional de álgebras (A, &#094;, V, h, 0, 1) llamadas E-retículos donde (A, &#094;, V, 0, 1) es un retículo distributivo acotado y h es un endomorfismo de retículos. Consideramos la sub-clase Ek de E-retículos k-cíclicos tales que para cada x, h k(x) = x; k es un entero positivo. Determinamos la estructura de los E-retículos k-cíclicos libres sobre un conjunto parcialmente ordenado usando resultados obtenidos por L. Monteiro en [9] para retículos distributivos libres sobre un conjunto parcialmente ordenado.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Distributive lattices]]></kwd>
<kwd lng="en"><![CDATA[free algebras]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face=verdana>      <p> <font size="4">        <center>     <b>Free k-cyclic E-lattices over a poset </b>    </center>   </font></p>     <p>&nbsp;</p>     <p><b>Luiz F. Monteiro<sup>1</sup></b> - <b>Aldo V. Figallo<sup>2</sup></b></p>     <p><sup>1</sup>Instituto de Matem&aacute;tica de Bah&iacute;a Blanca. INMABB-CONICET. Universidad    Nacional del Sur. Av. Alem 1253 (8000) Bah&iacute;a Blanca, Argentina </p>     <p>e-mail: <a href="mailto:luizmont@criba.edu.ar">luizmont@criba.edu.ar</a></p>      <p><sup>2</sup>Universidad Nacional del Sur, Argentina</p> <hr>     <p><b>Abstract.</b> In this note we consider a new equational class of algebras    called E-lattices (A, &#094;, V, h, 0, 1) where (A, &#094;, V, 0, 1) is a distributive    (0,1)-lattice and h is a lattice endomorphism. We consider the subclass <b>E</b><sub>k</sub>    of <i>k</i>-cyclic E-lattices such that <i>h<sup>k</sup>(x) = x</i>, for all    <i>x</i>, <i>k</i> is a positive integer. We determine the structure of the    free <i>k</i>-cyclic E-lattice over a poset using results obtained by L. Monteiro    in [9] for the free distributive lattice over a poset.</p>     <p><b><i>Keywords and phrases.</i></b> Distributive lattices, free algebras.</p>     ]]></body>
<body><![CDATA[<p><i>2000 Mathematics Subject Classification.</i> Primary: 06D, 08A50.</p> <hr size="1">     <p><b>Resumen.</b> En este art&iacute;culo consideramos una nueva clase ecuacional    de &aacute;lgebras (A, &#094;, V, h, 0, 1) llamadas E-ret&iacute;culos donde (A,    &#094;, V, 0, 1) es un ret&iacute;culo distributivo acotado y <i>h</i> es un endomorfismo    de ret&iacute;culos. Consideramos la sub-clase <b>E</b><sub>k</sub> de E-ret&iacute;culos    <i>k</i>-c&iacute;clicos tales que para cada <i>x</i>, <i>h<sup>k</sup>(x) =    x</i>; <i>k</i> es un entero positivo. Determinamos la estructura de los E-ret&iacute;culos    <i>k</i>-c&iacute;clicos libres sobre un conjunto parcialmente ordenado usando    resultados obtenidos por L. Monteiro en [9] para ret&iacute;culos distributivos    libres sobre un conjunto parcialmente ordenado.</p>  <hr>     <p>FULL TEXT IN <a href="pdf/rcm/v439n1/v39n1a05.pdf">PDF</a></p> <hr>     <p>    <center><b>References</b></center></p>     <!-- ref --><p> &#91;1&#93; M. Abad, Estructuras c&iacute;clica y mon&aacute;dica de un &aacute;lgebra    de Lukasiewicz n-valente, <i>Notas de L&oacute;gica Matem&aacute;tica</i> <b>36</b>,    Instituto de Matem&aacute;tica, Universidad Nacional del Sur, (1988). &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000018&pid=S0034-7426200500010000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;2&#93; R. Balbes &amp; P. Dwinger, <i>Distributive Lattices</i>, Univ.    of Missouri Press, Columbia, 1974.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000019&pid=S0034-7426200500010000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> &#91;3&#93; G. Birkhoff, <i>Lattice Theory</i> 3rd ed., Amer. Math. Soc.,    Col Pub., Providence, 1967. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000020&pid=S0034-7426200500010000500003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;4&#93; R. Cignoli, Moisil Algebras, <i>Notas de L&oacute;gica Matem&aacute;tica</i>    <b>27</b>, Instituto de Matem&aacute;tica, Universidad Nacional del Sur, (1970).&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000021&pid=S0034-7426200500010000500004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> &#91;5&#93; G. C. Moisil, Algebra schemelor cu elemente ventil, <i>Revista    Universitatii \C. I. Parhon&quot; si a Politehnicii Bucaresti Seria St. Nat.</i>    <b>4-5</b>, (1954), 9-42. &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=S0034-7426200500010000500005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;6&#93; G. C. Moisil, <i>Essais sur les logiques non chrysippiennes</i>.    Ed. Academiei Bucarest, 1972. &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=S0034-7426200500010000500006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;7&#93; A. Monteiro, <i>Algebras de Boole involutivas</i>, Lectures given    at the Universidad Nacional del Sur, Bah&iacute;a Blanca, Argentina. 1969.&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=S0034-7426200500010000500007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> &#91;8&#93; A. Monteiro, Alg&micro;ebres de Boole cycliques, <i>Revue roumaine    de Math. Pures et appliqu&eacute;ss</i>, <b>23</b> (1978), 71-76. &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=S0034-7426200500010000500008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;9&#93; L. Monteiro, Une construction du r&eacute;ticul&eacute; distributif    libre sur un ensemble ordonn&eacute;, <i>Colloquium Mathematicum XVII</i>, <b>1</b>    (1967), 23-27. &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=S0034-7426200500010000500009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>&#91;10&#93; H. Rasiowa &amp; R. Sikorski, <i>The Mathematics of Metamathematics</i>,    Polska Akademia Nauk, Monografie Matematyczne, Warszawa, 1963.&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=S0034-7426200500010000500010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>(Recibido en marzo de 2000. Aceptado en junio de de 2005) </p> </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[Abad]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang="es"><![CDATA[Estructuras cíclica y monádica de un álgebra de Lukasiewicz n-valente]]></article-title>
<source><![CDATA[Notas de Lógica Matemática]]></source>
<year>1988</year>
<volume>36</volume>
<publisher-name><![CDATA[Universidad Nacional del Sur]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Balbes]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Dwinger]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<source><![CDATA[Distributive Lattices]]></source>
<year>1974</year>
<publisher-loc><![CDATA[Columbia ]]></publisher-loc>
<publisher-name><![CDATA[Univ. of Missouri Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Birkhoff]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<source><![CDATA[Lattice Theory 3rd ed., Amer. Math. Soc.]]></source>
<year>1967</year>
<publisher-loc><![CDATA[Providence ]]></publisher-loc>
<publisher-name><![CDATA[Col Pub.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cignoli]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Moisil Algebras]]></article-title>
<source><![CDATA[Notas de Lógica Matemática]]></source>
<year>1970</year>
<volume>27</volume>
<publisher-name><![CDATA[Instituto de Matemática, Universidad Nacional del Sur]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Moisil]]></surname>
<given-names><![CDATA[G. C.]]></given-names>
</name>
</person-group>
<article-title xml:lang="it"><![CDATA[Algebra schemelor cu elemente ventil]]></article-title>
<source><![CDATA[Revista Universitatii \C. I. Parhon" si a Politehnicii Bucaresti Seria St. Nat.]]></source>
<year>1954</year>
<volume>4</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>9-42</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Moisil]]></surname>
<given-names><![CDATA[G. C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Essais sur les logiques non chrysippiennes]]></source>
<year>1972</year>
<publisher-loc><![CDATA[Bucarest ]]></publisher-loc>
<publisher-name><![CDATA[Ed. Academiei]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Monteiro]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[Algebras de Boole involutivas]]></source>
<year>1969</year>
<publisher-loc><![CDATA[Bahía Blanca ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Monteiro]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang="fr"><![CDATA[Algµebres de Boole cycliques]]></article-title>
<source><![CDATA[Revue roumaine de Math. Pures et appliquéss]]></source>
<year>1978</year>
<volume>23</volume>
<page-range>71-76</page-range></nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Monteiro]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<article-title xml:lang="fr"><![CDATA[Une construction du réticulé distributif libre sur un ensemble ordonné]]></article-title>
<source><![CDATA[Colloquium Mathematicum XVII]]></source>
<year>1967</year>
<volume>1</volume>
<page-range>23-27</page-range></nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rasiowa]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Sikorski]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<source><![CDATA[The Mathematics of Metamathematics]]></source>
<year>1963</year>
<publisher-loc><![CDATA[Warszawa ]]></publisher-loc>
<publisher-name><![CDATA[Polska Akademia Nauk]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
