摘要
The completely positive matrices are important in the study of block designs arizing incombinatorial analysis (see [11])and are related to copositive matrices,which have appli-cations in control theory and in multimobical programming (see [12]).An n×n matrix A is said to be completely positive if A can be factored as A=BB^T forsome n×m real matrix B with nonnegative entries for some m【∞.If A is a completelypositive matrix,then the smallest number of columns in a nonnegative matrix B such
基金
Supported by the Foundation of Science
Art of Central South University of Technology
