松驰
发表于 2025-3-30 10:48:52
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farewell
发表于 2025-3-30 16:01:56
One construct closed aspherical PL-manifolds which are not homotopy equivalent to closed smooth manifolds. Examples of closed aspherical T0P-manifolds which are not homeomorphic to closed PL-manifolds are also given.
飞行员
发表于 2025-3-30 18:45:16
Eunice Annan-Aggrey,Senanu Kwasi Kutor,Elmond Bandauko,Godwin ArkuOne construct closed aspherical PL-manifolds which are not homotopy equivalent to closed smooth manifolds. Examples of closed aspherical T0P-manifolds which are not homeomorphic to closed PL-manifolds are also given.
Amnesty
发表于 2025-3-30 22:38:15
This chapter is an introduction to the rich structure possessed by a set endowed with a group operation. The first notion we will explore is that of ., or subsets of a group that themselves satisfy all the properties of a group.
字的误用
发表于 2025-3-31 04:28:02
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Arrhythmia
发表于 2025-3-31 07:07:40
Mark A. Deka,Niaz MorshedWe have worked quite hard to find a space whose fundamental group is non-trivial. We should capitalize on this result and see if we can find other, related spaces whose fundamental groups can now be computed easily as a result of our hard work. An example where this approach is successful is for ..