The Department of Mathematics of the Universidad de la Frontera Temuco-Chile and the Department of Mathematics of the Universidade Federal de Pernambuco, Recife-Brazil, edit CUBO, A Mathematical Journal. CUBO appears in three issues per year and is indexed in ZentralBlatt Math., Mathematical Reviews, MathSciNet and Latin Index. CUBO publishes original research papers, preferably not longer than 20 printed pages, that contain substantial mathematical results in all branches of pure and applied mathematics.

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CUBO (I.S.S.N. 0716.7776) Editorial Office : Departamento de Matemática, Universidade Federal de Pernambuco, CEP 50740-540, Recife-PE., Brazil, cch@dmat.ufpe.br.