Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multipliers and Duality for Group Actions   We define operator-valued Schur and Herz--Schur multipliers in terms of
module actions, and show that the standard properties of these multipliers
follow from well-known facts about these module actions and duality theory for
group actions. These results are applied to study the Herz--Schur multipliers
of an abelian group acting on its Pontryagin dual: it is shown that a natural
subset of these Herz--Schur multipliers can be identified with the classical
Herz--Schur multipliers of the direct product of the group with its dual group.

12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th