Geodesic
On class A operators
Sungeun Jung 1   ; Eungil Ko 1   ; Mee-Jung Lee 1
1 Department of Mathematics Ewha Women's University 120-750 Seoul, Korea
Studia Mathematica, Tome 198 (2010) no. 3, pp. 249-260 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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We show that every class A operator has a scalar extension. In particular, such operators with rich spectra have nontrivial invariant subspaces. Also we give some spectral properties of the scalar extension of a class A operator. Finally, we show that every class A operator is nonhypertransitive.
DOI : 10.4064/sm198-3-4
Keywords: every class operator has scalar extension particular operators rich spectra have nontrivial invariant subspaces spectral properties scalar extension class operator finally every class operator nonhypertransitive

Sungeun Jung  1   ; Eungil Ko  1   ; Mee-Jung Lee  1

1 Department of Mathematics Ewha Women's University 120-750 Seoul, Korea 
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Sungeun Jung; Eungil Ko; Mee-Jung Lee. On class A operators. Studia Mathematica, Tome 198 (2010) no. 3, pp. 249-260. doi: 10.4064/sm198-3-4

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