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The Backward Shift On HP, William T. Ross
The Backward Shift On HP, William T. Ross
Department of Math & Statistics Faculty Publications
In this semi-expository paper, we examine the backward shift operator
Bf := (f-f(0)/z
on the classical Hardy space Hp. Through there are many aspects of this operator worthy of study [20], we will focus on the description of its invariant subspaces by which we mean the closed linear manifolds Ɛ ⊂ Hp for which BƐ ⊂ Ɛ. When 1 < p < ∞, a seminal paper of Douglas, Shapiro, and Shields [8] describes these invariant subspaces by using the important concept of a pseudocontinuation developed earlier by Shapiro [26]. When p = 1, the description is the same [1] except that in the proof, one must be mindful of some technical considerations involving the functions of bounded mean oscillation.
Bergman Spaces On Disconnected Domains, William T. Ross, Alexandru Aleman, Stefan Richter
Bergman Spaces On Disconnected Domains, William T. Ross, Alexandru Aleman, Stefan Richter
Department of Math & Statistics Faculty Publications
For a bounded region G C C and a compact set K C G, with area measure zero, we will characterize the invariant subspaces M (under f -> zf)of the Bergman space Lpa(G \ K), 1 ≤ p < ∞, which contain Lpa(G) and with dim(M/(z - λ)M) = 1 for all λϵ G \ K. When G \ K is connected, we will see that di\m(M /(z — λ)M) = 1 for all λ ϵ G \ K and thus in this case we will have a complete …