## Smooth vector bundles and local coordinates

In this entry we remind the reader of the definition of a smooth vector bundle and give a local coordinates for a smooth section.

**Definition** [Milnor-Stasheff] A *rank n vector bundle* is a map and a vector space structure on for all so that and fiber-preserving homeo so that is a v.s. iso. To define a *smooth vector bundle* one requires that E and X are manifolds and the ‘s are diffeomorphisms.

Definition [Steenrod (see also Davis-Kirk)] A *rank n vector bundle* is a map and a collection of homeos so that

To define a *smooth vector bundle* one requires that X is a manifold and the are smooth.

A *smooth section* is a smooth map s.t. .

The vector space of smooth sections is a module over the ring of continuous functions .

e.g.

A smooth section of an -plane bundle over an -manifold is locally an element of . To make this precise and charts and . Then via

## Leave a Reply