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The nonnegative P_0-matrix completion problem
(International Linear Algebra Society, 2014)
In this paperthe nonnegative P0-matrix completion problem is considered. It is shown that a pattern for 4 × 4 matrices that includes all diagonal positions has nonnegative P0- completion if and only if its digraph is ...
Suborbits and Suborbital Graphs of the Symmetric Group n S acting on Ordered r-element Subsets
(2013)
The ranks and subdegrees of the symmetric group n S acting on [r] X , the set of all ordered r-element subsets from X have been studied (See Rimberia [4]). In this paper, we examine some properties of suborbits and suborbital ...
The – matrix completion problem for digraphs of matrices with less than four directed lines
(Innovative Journal, 2013)
A real matrix is said to be –matrix if its principal minors are nonnegative and all its non-diagonal entries are non-positive. In this project, we consider the –matrix completion problem. It is shown that any digraph with ...
Limitations in the convectional isbn-10 code.
(2012-02)
The International Standard Book Number system (ISBN-10) which was in operation until 2007 uniquely identified every book published internationally but was later replaced with the ISBN-13. The code was had the ability to ...