Collapsing Riemannian manifolds to the circle
In this paper we study the manifolds which collapse to a circle. The main result is to prove that if the Riemannian manifold collapses to a circle, then the manifold admits a finite covering space which is homeomorphic to a compact solv-manifold for the dimension \(n\neq 4\).
scientific article; zbMATH DE number 4080315