科研之友
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摘要
In this short note, we construct a nonsingular matrix A whose graph is a double star of order n %26gt;= 4 with n - 2 P-vertices. This example leads to a positive answer, for n %26gt;= 6, to a last open question proposed recently by Kim and Shader regarding the trees for which each nonsingular matrix has at most n 2 - P-vertices.
- 出版日期2013-10-28
