A topological groupoid over is a Groupoid such that and are Topological Spaces and , , and multiplication are continuous maps. Here, and are maps from onto with and

**References**

Weinstein, A. ``Groupoids: Unifying Internal and External Symmetry.'' *Not. Amer. Math. Soc.* **43**, 744-752, 1996.

© 1996-9

1999-05-26