Abstract
Dwyer and Wilkerson gave a definition of a pâcompact group, which is a loop space with certain properties and a good generalisation of the notion of compact Lie groups in terms of classifying spaces and homotopy theory; e.g. every pâcompact group has a maximal torus, a normalizer of the maximal torus and a Weyl group. The believe or hope that pâcompact groups enjoys most properties of compact Lie groups establishes a program for the classification of these objects. Following the classification of compact connected Lie groups, one step in this program is to show that every simply connected pâcompact group splits into a product of simply connected simple pâcompact groups. The proof of this splitting theorem is based on the fact that every classifying space of a pâcompact group splits into a product if the normalizer of the maximal torus does.
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