THE M_0 – MATRIX COMPLETION PROBLEM FOR DIGRAPHS OF 5×5 MATRICES WITH LESS THAN FOUR DIRECTED LINES
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Abstract
A real  matrix is said to be –matrix if its principal minors are non-negative 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 less than four directed lines which is not a cycle has –completion. It is further shown that digraph of  matrix with less than four directed lines which is a cycle does not have –completion.
AMS Subject Classification: 0070
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