An anchor is the Bundle Map from a Vector Bundle to the Tangent Bundle *TB* satisfying

- 1.
and

- 2.

**References**

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

© 1996-9

1999-05-25