The Stability Radius of Fredholm Linear
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C. Badea; M. Mbekhta
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Article
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2001
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Elsevier Science
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English
⚖ 116 KB
Let T and S be two bounded linear operators from Banach spaces X into Y, Ž . and suppose that T is Fredholm and dim N T y S is constant in a neighborhood Ž . Ž . of s 0. Let d T; S be the supremum of all r ) 0 such that dim N T y S and Ž . < < codim R T y S are constant for all withr. It is a conseq