Browsing Revista Colombiana de Matemáticas by Author "Marrero, Osvaldo"
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A conjecture concerning the existence of certain combinatorial designs
Marrero, OsvaldoThis 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, OsvaldoThe 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.