کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4661046 | 1344397 | 2008 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Lifting of homeomorphisms to 4-sheeted branched coverings of a disk
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
هندسه و توپولوژی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Let p:X→D be a simple, possibly not connected, 4-sheeted branched covering of a closed 2-dimensional disk D with n branch values A1,…,An. The isotopy classes of homeomorphisms of D which are fixed on the boundary of D and permute the branch values form a braid group Bn. Some of these homeomorphisms can be lifted to homeomorphisms of X. They form a subgroup L(p) of finite index in Bn. For each equivalence class of coverings we find a set of generators for L(p) which contains between n and n+4 elements, depending on the equivalence class of the covering, and the generators are powers of half-twists.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Topology and its Applications - Volume 155, Issue 16, 1 October 2008, Pages 1820-1839
Journal: Topology and its Applications - Volume 155, Issue 16, 1 October 2008, Pages 1820-1839