American Institute of Mathematical Sciences

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2005, 2005(Special): 225-232. doi: 10.3934/proc.2005.2005.225

An integral representation of the determinant of a matrix and its applications

Joshua Du 1, and  Jun Ji 1,

1. 

Department of Mathematics, Kennesaw State University, 1000 Chastain Rd, P.O. Box 1204, Kennesaw, GA 30144, United States, United States

Received  August 2004 Revised  March 2005 Published  September 2005

The Hadamard determinant theorem states that the ratio of the determinant of a square matrix over the complex field to the product of its main diagonal elements is less than or equal to one for a positive definite Hermitian matrix. An integral representation of this ratio for both positive definite Hermitian matrix and diagonally dominant real matrix is given in this paper. Using this new identity, an alternative proof of the famous Hadamard determinant theorem is discussed. In addition, a lower bound of determinant in terms of the product of the main diagonal elements is given. Finally, a numerical algorithm fundamentally different from current approaches in literature is also proposed for the computation of the determinant of a small and dense matrix. Numerical experiments indicate that this new approach is robust.
Keywords: integral representation, computation of determinant., Hadamard determinant theorem, Differential equation.
Mathematics Subject Classification: Primary: 15A15 and 65F40; Secondary: 34A3.
Citation: Joshua Du, Jun Ji. An integral representation of the determinant of a matrix and its applications. Conference Publications, 2005, 2005 (Special) : 225-232. doi: 10.3934/proc.2005.2005.225
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