2 papers
math.NT2011
On a variant of Giuga numbers
Jose Maria Grau, Florian Luca, Antonio M. Oller-Marcen
In this paper, we characterize the odd positive integers satisfying the congruence . We show that the set of such positive…
math.CO2010
Isotropic subspaces of Orlik-Solomon algebras
Miguel A. Marco-Buzunariz
We give a combinatorial characterization of isotropic subspaces in the Orlik- Solomon algebra of a hyperplane arrangement in terms of decorations of its intersection lattice. We th…