Generalized homogeneous geometric structures (Q2366389)

As a generalization of Lie group pairs the author defines a \(Z\)-aggregate and a morphism of a \(Z\)-aggregate. The \(Z\)-aggregates form a category. He gives several examples of \(Z\)-aggregates in special cases and then he proves several theorems about \(Z\)-transitive structures of finite type and connections on \(Z\)-transitive structures.