Abstract
This paper deals with the following inverse eigenvalue problem: Given an n by n real symmetric matrix A and a set of real numbers { λ i } 1 n , find a diagonal matrix D such that A + D has eigenvalues λ i . For the solvability of this problem a number of necessary conditions and sufficient conditions are known. In this work, new necessary conditions are derived, while some sufficient conditions are optimized. In particular, one sufficient condition due to Morel is obtained by optimizing a sufficient condition discovered by Laborde.
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