Backward Shift Invariant Operator Ranges
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Sarah H. Ferguson
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Article
📅
1997
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Elsevier Science
🌐
English
⚖ 380 KB
Results on first order Ext groups for Hilbert modules over the disk algebra are used to study certain backward shift invariant operator ranges, namely de Branges Rovnyak spaces and a more general class called H(W ; B) spaces. Necessary and sufficient conditions are given for the groups Ext 1 A(D) (H