Definition 0.1
The Fourier-Stieltjes algebra of a groupoid,
.
In ref. [
3]), A.L.T. Paterson defined the
Fourier-Stieltjes algebra of a groupoid,

, as the space of coefficients

, where

are

-sections for some measurable

-Hilbert bundle

. Thus, for

,
 |
(0.1) |
Therefore,
belongs to
.