Abstract
Using a unified approach based on the monotonicity property of the Perron root and its circuit extension, a series of exact two-sided bounds for the Perron root of a nonnegative matrix in terms of paths in the associated directed graph is obtained. A method for deriving the so-called mixed upper bounds is suggested. Based on the upper bounds for the Perron root, new diagonal dominance type conditions for matrices are introduced. The singularity/nonsingularity problem for matrices satisfying such conditions is analyzed, and the associated eigenvalue inclusion sets are presented. In particular, a bridge connecting Gerschgorin disks with Brualdi eigenvalue inclusion sets is found. Extensions to matrices partitioned into blocks are proposed.
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Communicated by L. Cvetković.
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Kolotilina, L.Y. Bounds for the Perron root, singularity/nonsingularity conditions, and eigenvalue inclusion sets. Numer Algor 42, 247–280 (2006). https://doi.org/10.1007/s11075-006-9041-7
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DOI: https://doi.org/10.1007/s11075-006-9041-7