Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The centre of the bidual of Fourier algebras (discrete groups)   For a discrete group G with Fourier algebra A(G), we study the topological
centre $Z_t$ of the bidual. If G is amenable, then $Z_t$ = A(G). But if G
contains a non-abelian free group $F_r$, we show that $Z_t$ is strictly larger
than A(G). Furthermore, it is shown that the subalgebra of radial functions in
A(G) is Arens regular.

27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat