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On Taylor’s formula for the resolvent of a complex matrix
Matthew X. Hea, Paolo E. Ricci b, _
Article history:Received 25 June 2007
Received in revised form 14 March 2008
Accepted 25 March 2008
Keywords:Powers of a matrix
Matrix invariants
Resolvent
1. Introduction
As a consequence of the Hilbert identity in [1], the resolvent ) ( A R = 1 ) ( A of a nonsingular square matrix A (
denoting the identity matrix) is shown to be an analytic function of the parameter
in any domain D with empty intersection with the spectrum A of A . Therefore, by using Taylor expansion in a neighborhood of any fixed D 0 , we can find in [1] a representation formula for ) ( A R
using all powers of ) ( 0 A R .
In this article, by using some preceding results recalled, e.g., in [2], we write down a representation formula using only afinite number of powers of ) ( 0 A R . This seems to be natural since only the first powers of ) ( 0 A R
are linearly independent.The main tool in this framework is given by the multivariable polynomials ) ,..., , ( 2 1 , r n k v v v F
( ,... 1 , 0 , 1 n ; r m k ,..., 2 , 1 ) (see [2 – 6]), depending on the invariants ) ,..., , ( 2 1 r v v v
of ) ( A R ); heremdenotes the degree of the |
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