Lower bounds for the spread of a Hermitian matrix
The authors present new lower bounds for the spread of a Hermitian matrix in terms of its entries. The results include a bound which is sharper than a recent result due to \textit{E. R. Barnes} and \textit{A. J. Hoffman} [Linear Algebra Appl. 201, 79-90 (1994; Zbl 0803.15016)] in spite of the fact that the latter bound is attained. Numerical examples are used to compare the results with other known results.
scientific article; zbMATH DE number 1011342