||This article may be too technical for most readers to understand. (May 2014)|
In topology, a branch of mathematics, a string group is an infinite-dimensional group String(n) introduced by Stolz (1996) as a 3-connected cover of a spin group. A string manifold is a manifold with a lifting of its frame bundle to a string group bundle. This means that in addition to being able to define holonomy along paths, one can also define holonomies for surfaces going between strings.
where K(Z, 2) is an Eilenberg–MacLane space and Spin(n) is a spin group.
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