Suppose A ∈ L(Y ,Z ) , B ∈ L(X ,Y ) are Fredholm operators acting in linear spaces. By referring to the correspondence between Fredholm operators and their determinant systems, we derive the formulas for a determinant system for AB which are expressed via determinant systems for A and B. In our approach, applying results of the theory of determinant systems plays the crucial role and yields Cauchy-Binet type formulas. The formulas are utilized in many branches of applied science and engineering.
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In the paper we apply the modified powers of algebraic quasinuclei to construction of determinant systems for quasinuclear perturbations of Fredholm operators. Given two pairs (Ξ, X), (Ω, Y) of conjugate linear spaces, an algebraic quasinucleus F ∈ an (Ω → Ξ, X → Y) and a determinant system for the Fredholm operator S ∈op(Ω →Ξ, X → Y), we obtain algebraic formulas for terms of a determinant system for S + TF.
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