Geodesic
On the topological boundary of the one-sided spectrum
Czechoslovak Mathematical Journal, Tome 49 (1999) no. 3, pp. 561-568 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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It is well-known that the topological boundary of the spectrum of an operator is contained in the approximate point spectrum. We show that the one-sided version of this result is not true. This gives also a negative answer to a problem of Schmoeger.
It is well-known that the topological boundary of the spectrum of an operator is contained in the approximate point spectrum. We show that the one-sided version of this result is not true. This gives also a negative answer to a problem of Schmoeger.
Classification : 47A10 
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Müller, Vladimír. On the topological boundary of the one-sided spectrum. Czechoslovak Mathematical Journal, Tome 49 (1999) no. 3, pp. 561-568. http://geodesic.mathdoc.fr/item/CMJ_1999_49_3_a8/

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