Isometries of real and complex Hilbert C*-modules
博士 === 國立中山大學 === 應用數學系研究所 === 100 === Let A and B be real or complex C*-algebras. Let V and W be real or complex (right) full Hilbert C*-modules over A and B, respectively. Let T be a linear bijective map from V onto W. We show the following four statements are equivalent. (a) T is a unitary operat...
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ndltd-TW-100NSYS55070752015-10-13T21:22:19Z http://ndltd.ncl.edu.tw/handle/65738727022766899829 Isometries of real and complex Hilbert C*-modules 實數與複數西爾伯特丙星模間的等距算子 Ming-Hsiu Hsu 許銘修 博士 國立中山大學 應用數學系研究所 100 Let A and B be real or complex C*-algebras. Let V and W be real or complex (right) full Hilbert C*-modules over A and B, respectively. Let T be a linear bijective map from V onto W. We show the following four statements are equivalent. (a) T is a unitary operator, i.e., there is a ∗-isomorphism α : A → B such that <Tx,Ty> = α(<x,y>), ∀ x,y∈ V ; (b) T preserves TRO products, i.e., T(x<y,z>) =Tx<Ty,Tz>, ∀ x,y,z in V ; (c) T is a 2-isometry; (d) T is a complete isometry. Moreover, if A and B are commutative, the four statements are also equivalent to (e) T is a isometry. On the other hand, if V and W are complex Hilbert C*-modules over complex C*-algebras, then T is unitary if and only if it is a module map, i.e., T(xa) = (Tx)α(a), ∀ x ∈ V,a ∈ A. Ngai-Ching Wong 黃毅青 2012 學位論文 ; thesis 50 en_US |
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博士 === 國立中山大學 === 應用數學系研究所 === 100 === Let A and B be real or complex C*-algebras. Let V and W be real or complex (right) full
Hilbert C*-modules over A and B, respectively. Let T be a linear bijective map from V onto
W. We show the following four statements are equivalent.
(a) T is a unitary operator, i.e., there is a ∗-isomorphism α : A → B such that
<Tx,Ty> = α(<x,y>), ∀ x,y∈ V ;
(b) T preserves TRO products, i.e., T(x<y,z>) =Tx<Ty,Tz>, ∀ x,y,z in V ;
(c) T is a 2-isometry;
(d) T is a complete isometry.
Moreover, if A and B are commutative, the four statements are also equivalent to
(e) T is a isometry.
On the other hand, if V and W are complex Hilbert C*-modules over complex C*-algebras,
then T is unitary if and only if it is a module map, i.e.,
T(xa) = (Tx)α(a), ∀ x ∈ V,a ∈ A.
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author2 |
Ngai-Ching Wong |
author_facet |
Ngai-Ching Wong Ming-Hsiu Hsu 許銘修 |
author |
Ming-Hsiu Hsu 許銘修 |
spellingShingle |
Ming-Hsiu Hsu 許銘修 Isometries of real and complex Hilbert C*-modules |
author_sort |
Ming-Hsiu Hsu |
title |
Isometries of real and complex Hilbert C*-modules |
title_short |
Isometries of real and complex Hilbert C*-modules |
title_full |
Isometries of real and complex Hilbert C*-modules |
title_fullStr |
Isometries of real and complex Hilbert C*-modules |
title_full_unstemmed |
Isometries of real and complex Hilbert C*-modules |
title_sort |
isometries of real and complex hilbert c*-modules |
publishDate |
2012 |
url |
http://ndltd.ncl.edu.tw/handle/65738727022766899829 |
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