Minimal Factorizations of Rational Matrix Functions
Harm Bart, Israel Gohberg, M. A. Kaashoek · Operator theory · 1979
Let W be a rational n×n matrix function, and let λ0∈θ. In a deleted neighbourhood of λ0 we have the following expansion (4.1) W(λ)= ∑ j=−q ∞ (λ− λ 0 ) j W j $$ [tex]W(\lambda ) = {\sum\limits_{j=-q}^\infty {(\lambda - {\lambda _0})} ^j}{W_j}[/tex]$$ .