In mathematics, a bundle is a generalization of a fiber bundle dropping the condition of a local product structure. The requirement of a local product structure rests on the bundle having a topology. Without this requirement, more general objects can be considered bundles. For example, one can consider a bundle π: E → B with E and B sets. It is no longer true that the preimages must all look alike, unlike fiber bundles, where the fibers must all be isomorphic (in the case of vector bundles) and homeomorphic.
