منابع مشابه
On digital simply connected spaces and manifolds: a digital simply connected 3-manifold is the digital 3-sphere
In the framework of digital topology, we study structural and topological properties of digital ndimensional manifolds. We introduce the notion of simple connectedness of a digital space and prove that if M and N are homotopy equivalent digital spaces and M is simply connected, then so is N. We show that a simply connected digital 2-manifold is the digital 2-sphere and a simply connected digita...
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Let $A$ be a nite dimensional $k-$algebra and $R$ be a locally bounded category such that $R rightarrow R/G = A$ is a Galois covering dened by the action of a torsion-free group of automorphisms of $R$. Following [30], we provide criteria on the convex subcategories of a strongly simply connected category R in order to be a cycle- nite category and describe the module category of $A$. We p...
متن کاملsome results of semilocally simply connected property
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ژورنال
عنوان ژورنال: Journal of Topology
سال: 2010
ISSN: 1753-8416
DOI: 10.1112/jtopol/jtq028