Now showing items 1-2 of 2

    • A conjecture concerning the existence of certain combinatorial designs 

      Marrero, Osvaldo
      This note presents a conjecture about the existence of a particular class of combinatorial designs; the consideration of this particular class of designs was suggested during the course of previous work on modular Hadamard ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas. 
    • Eigenvalues of nonsingular matrices and combinatorial applications 

      Marrero, Osvaldo
      The purpose of this orticle is to present a result about eigenvalues of nonsingular matrices and to observe that this result implies a theorem of this author on combinatorial desiqns as well as other combinatorial results. ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas.