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We find sufficient conditions for a cotriad of which the objects are locally trivial fibrations, in order that the push-out be a locally trivial fibration. As an application, the universal -bundle of a finite group , and the classifying space is modeled by locally finite spaces. In particular, if is finite, then the universal -bundle is the limit of an ascending chain of finite spaces. The bundle projection is a covering projection.
We prove a new adjunction theorem for n-equivalences. This theorem enables us to produce a simple geometric version of proof of the triad connectivity theorem of Blakers and Massey. An important intermediate step is a study of the collapsing map S∨X → S, S being a sphere.
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