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representations of locally compact groupoids (Topic)
Definition 0.1   Let $ {\mathsf{G}}_{lc}$ be a locally compact (topological) groupoid endowed with a Haar system $ \nu = \nu^u, u \in U_{{\mathsf{G}}_{lc}}$ . Then a representation of $ {\mathsf{G}}_{lc}$ together with the its associated Haar system $\nu$ is defined as a triple $ (\mu, U_{{\mathsf{G}}_{lc}} * \H , L)$ , where: $\mu$ is a quasi-invariant measure defined over $ U_{{\mathsf{G}}_{lc}}$ ,

$ U_{{\mathsf{G}}_{lc}}*\H$ is an analytical, fibered Hilbert space or Hilbert bundle over $ U_{{\mathsf{G}}_{lc}}$ , and

$ L: U_{{\mathsf{G}}_{lc}} \longrightarrow {Iso} (U_{{\mathsf{G}}_{lc}}*\H )$ is a Borelian (or borelian) groupoid morphism whose restriction on $ U_{{\mathsf{G}}_{lc}}$ is the identification map, that is, $ U_{{Iso}(U_{{\mathsf{G}}_{lc}}*\H )}$ is being identified via $L$ with $ U_{{\mathsf{G}}_{lc}}$ . Thus,

$L(x)= [r(x), \tilde{L}(x), d(x)]$ ,

where $ \tilde{L}(x): \H (d(x)) \longrightarrow \H (r(x))$ is a Hilbert space $ \H $ isomorphism.




"representations of locally compact groupoids" is owned by bci1.
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See Also: quasi-invariant, groupoid and group representations related to quantum symmetries, uniform continuity over locally compact quantum groupoids, locally compact quantum group

Other names:  representations of topological groupoids
Also defines:  representation of locally compact groupoids, Haar system triple
Keywords:  locally compact groupoids, Haar system, quasi-invariant measure, topological groupoids, representations, Hilbert spaces
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Cross-references: isomorphism, map, restriction, groupoid morphism, Hilbert bundle, Hilbert space, measure, quasi-invariant, associated Haar system, representation, Haar system, groupoid, locally compact
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This is version 12 of representations of locally compact groupoids, born on 2008-07-26, modified 2008-08-23.
Object id is 10876, canonical name is RepresentationsOfLocallyCompactGroupoids.
Accessed 1068 times total.

Classification:
AMS MSC55U40 (Algebraic topology :: Applied homological algebra and category theory :: Topological categories, foundations of homotopy theory)
 55P10 (Algebraic topology :: Homotopy theory :: Homotopy equivalences)
 55N20 (Algebraic topology :: Homology and cohomology theories :: Generalized homology and cohomology theories)
 55N33 (Algebraic topology :: Homology and cohomology theories :: Intersection homology and cohomology)
 18D05 (Category theory; homological algebra :: Categories with structure :: Double categories, $2$-categories, bicategories and generalizations)

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