Journal of East China Normal University(Natural Sc ›› 2009, Vol. 2009 ›› Issue (4): 35-38.

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Inverse eigenvalue problem for nonnegative matrices

SHAN Song-ling   

  1. Department of Mathematics, East China Normal University, Shanghai}\, 200241
  • Received:2009-01-12 Revised:2009-03-06 Online:2009-07-25 Published:2009-07-25
  • Contact: SHAN Song-ling

Abstract: For any given complex number $\lambda$, this paper proved that there exists a
3 by 3 nonnegative matrix
\textbf{\emph{A}} with at least 4 zero entries such that $\lambda$ is an eigenvalue of \textbf{\emph{A}}.
The number 4 of zero entries here is the largest possible.

Key words: inverse eigenvalue, companion matrix , nonnegative matrices, inverse eigenvalue, companion matrix

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