Abstract
In the case when the homogeneous equation has nontrivial solutions, the Riesz theory, i.e., Theorem 3.4 gives no answer to the question of whether the inhomogeneous equation for a given inhomogeneity is solvable. This question is settled by the Fredholm alternative, which we shall develop in this chapter. Rather than presenting it in the context of the Riesz-Schauder theory for the adjoint operator in the dual space we will consider the Fredholm theory for compact adjoint operators in dual systems generated by nondegenerate bilinear or sesquilinear forms. This symmetric version is more elementary and better suited for applications to integral equations.
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© 1999 Springer Science+Business Media New York
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Kress, R. (1999). Dual Systems and Fredholm Alternative. In: Linear Integral Equations. Applied Mathematical Sciences, vol 82. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-0559-3_4
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DOI: https://doi.org/10.1007/978-1-4612-0559-3_4
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4612-6817-8
Online ISBN: 978-1-4612-0559-3
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