The Fourier-Stieltjes and Fourier algebras for locally compact groupoids

Details The Fourier-Stieltjes and Fourier algebras for locally compact groupoids The Fourier-Stieltjes and Fourier algebras for locally compact groupoids

2003-10-09

arxiv.org/abs/math/0310138v1

Contemporary Mathematics 321(2003), 223-237

Mathematics

Operator Algebras

Scientific paper

The Fourier-Stieltjes and Fourier algebras B(G), A(G) for a general locally compact group G, first studied by P. Eymard, have played an important role in harmonic analysis and in the study of operator algebras generated by G. Recently, there has been interest in developing versions of these algebras for locally compact groupoids, justification being that, just as in the group case, the algebras should play a useful role in the study of groupoid operator algebras. Versions of these algebras for the locally compact groupoid case appear in three related theories: (1) a measured groupoid theory (J. Renault), (2) a Borel theory (A. Ramsay and M. Walter), and (3) a continuous theory (A. Paterson). The present paper is expository in character. For motivational reasons, it starts with a description of the theory of B(G), A(G) in the locally compact group case, before discussing these three realted theories. Some open questions are also raised.

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