Definition 0.1 Two
representations of
groupoids

, for

are called
equivalent if

, and if there also exists a fiber-preserving
isomorphism of analytical Hilbert space bundles

, where

is a measurable subset of

of null complementarity; the isomorphism

also has the following property:
![$\hat{v}[r(x)]\hat{L}_1(x) = \hat{L}_2 \hat{v}[d(x)]$ $\hat{v}[r(x)]\hat{L}_1(x) = \hat{L}_2 \hat{v}[d(x)]$](http://images.physicslibrary.org/cache/objects/703/l2h/img8.png)
for

.