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Fredholm operator information


In mathematics, Fredholm operators are certain operators that arise in the Fredholm theory of integral equations. They are named in honour of Erik Ivar Fredholm. By definition, a Fredholm operator is a bounded linear operator T : X → Y between two Banach spaces with finite-dimensional kernel and finite-dimensional (algebraic) cokernel , and with closed range . The last condition is actually redundant.[1]

The index of a Fredholm operator is the integer

or in other words,

  1. ^ Abramovich, Yuri A.; Aliprantis, Charalambos D. (2002). An Invitation to Operator Theory. Graduate Studies in Mathematics. Vol. 50. American Mathematical Society. p. 156. ISBN 978-0-8218-2146-6.

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