# IJPAM: Volume 65, No. 1 (2010)

-RANKS AND LINEAR PROJECTIONS

E. Ballico
Department of Mathematics
University of Trento
38 123 Povo (Trento) - Via Sommarive, 14, ITALY
e-mail: ballico@science.unitn.it

Abstract.Fix an integral . Here we consider the description of all pairs , , such that , where is the linear projection from , the -rank is the minimal cardinality of a set such that and is defined in a similar way.