Abstract
A geometric diagram of groups, which consists of groups equipped with geometric antistructures, is a natural generalization of the square of fundamental groups arising in the splitting problem for a one-sided submanifold. In the present paper the groups and of such diagrams are defined and the properties of these groups are described. Methods for the computation of , -groups and natural maps in diagrams of exact sequences are developed in the case of a geometric diagram of finite 2-groups.
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