# nLab numerable fiber bundle

Contents

### Context

#### Bundles

bundles

fiber bundles in physics

# Contents

## Idea

For the theory of fiber bundles to be well-behaved one typically needs to restrict to those that have a local trivialization not just over any open cover but over a numerable open cover – these are the numerable bundles. Since this condition is automatic if the base space is paracompact the condition is often not made explicit.

## Definition

###### Definition

(numerable fiber bundle)

A fiber bundle over a topological space is called numerable if it admits a local trivialization over a numerable open cover.

## Properties

###### Remark

Various results for classifying spaces that classify arbitrary fiber bundles over paracompact topological spaces generalizes (only) to a classification of numerable bundles over general topological spaces.

###### Remark

The conclusion that the bundle projection of a topological fiber bundle is a Hurewicz fibration follows generally only for numberable bundles (by this Prop.)

Last revised on March 24, 2021 at 11:26:44. See the history of this page for a list of all contributions to it.