Knotted 3-balls in S^4
Knotted 3-balls in S^4
复制标题
S^4 中的打结 3 球
DOI:
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发表时间:
2019
期刊:
影响因子:
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通讯作者:
David Gabai
中科院分区:
文献类型:
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作者:
R. Budney;David Gabai
The unknot U in S^4 has non-unique smooth spanning 3-balls up to isotopy fixing U. Equivalently there are properly embedded non separating 3-balls in S^1 x B^3 not properly isotopic to {*} x B^3. In the process we construct subgroups of the low-dimensional homotopy groups of Diff(S^1 x B^n fixing boundary) via fiber sequences that relate thesediffeomorphism groups to spaces of embeddings Emb(S^1, S^1 x S^n).