fungus
发表于 2025-3-21 17:50:42
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BILK
发表于 2025-3-21 21:50:35
https://doi.org/10.1007/978-3-322-91128-5oups of 2-manifolds. The situatuion is entirely different for dimension 4 because all finitely presentable groups appear as fundamental groups of 4-manifolds (see below). Hence it is not surprising that there is no obvious answer to the question of what happens in dimension 3.
habitat
发表于 2025-3-22 01:42:04
3-Manifolds and Knotsoups of 2-manifolds. The situatuion is entirely different for dimension 4 because all finitely presentable groups appear as fundamental groups of 4-manifolds (see below). Hence it is not surprising that there is no obvious answer to the question of what happens in dimension 3.
defuse
发表于 2025-3-22 08:26:49
Book 1993ide-ranging survey of combinatorial group theory, with emphasis very much on the geometric roots of the subject. This will be a useful reference work for the expert, as well as providing an overview of the subject for the outsider or novice. Many different topics are described and explored, with the
misanthrope
发表于 2025-3-22 09:14:34
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Glycogen
发表于 2025-3-22 16:26:22
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意外
发表于 2025-3-22 17:47:04
0938-0396 ist of open problems, some of which have not been consideredFrom the reviews: "... The book under review consists of two monographs on geometric aspects of group theory ... Together, these two articles form a wide-ranging survey of combinatorial group theory, with emphasis very much on the geometric
Perigee
发表于 2025-3-22 23:03:11
,Unterprogramme für Statistische Analysen, in Chapter 1 as fundamental groups of graphs and seen how this kind of representation of a free group enables one to obtain results about subgroups. In this section we work directly with words and derive some elementary properties of free groups.
NAG
发表于 2025-3-23 04:32:49
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污秽
发表于 2025-3-23 05:52:55
Group Presentations and 2-Complexes .(.). (Note that for an abelian group . the minimal number of elements needed to generate the quotient of . by the torsion subgroup is often called the rank of . however we will call this the ., see 1.1.12.)