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On Taylor’s formula for the resolvent of a complex matrix
Matthew X. He a , 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 ( 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 . 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 a finite 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 ); here m denotes the degree of the minimal polynomial. 2. Powers of matrices a nd
n k F ,
functions We recall in this section some results on representation formulas for powers of matrices (see e.g. [2 – 6] and the references therein). For simplicity we refer to the case when the matrix is nonderogatory so that r m . Proposition 2.1. Let
be an ) 2 ( r r r
complex matrix, and denote by r u u u ,..., , 2 1
the invariants of , and by r j j r j j u A P 0 ) 1 ( ) det( ) ( . its characteristic polynomial (by convention 1 0 u ); then for the powers of
with |
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