Geometry of epimorphisms and frames
Geometry of epimorphisms and frames
复制标题
外态和框架的几何
DOI:
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发表时间:
2004
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通讯作者:
D. Stojanoff
中科院分区:
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作者:
G. Corach;M. Pacheco;D. Stojanoff
Using a bijection between the set B H of all Bessel sequences in a (separable) Hilbert space H and the space L(l 2 ,H) of all (bounded linear) operators from l 2 to H, we endow the set F of all frames in H with a natural topology for which we determine the connected components of F. We show that each component is a homogeneous space of the group GL(l 2 ) of invertible operators of l 2 . This geometrical result shows that every smooth curve in F can be lifted to a curve in GL(l 2 ): given a smooth curve γ in F such that γ(0) = Ξ, there exists a smooth curve Γ in GL(l 2 ) such that γ = Γ Ξ, where the dot indicates the action of GL(l 2 ) over F. We also present a similar study of the set of Riesz sequences.