Instanton Homology of Seifert Fibred Homology Three Spheres

Instanton Homology of Seifert Fibred Homology Three Spheres
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Seifert 纤维同源性三球体的 Instanton 同源性

DOI:
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发表时间:
1990
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影响因子:
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通讯作者:
R. Stern
R. Stern
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文献类型:
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作者:
R. Fintushel;R. Stern

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对于有向整同调3-球面2,A. Casson在SU(2)中引入了一个整数不变量A(2),它是通过利用^(2)的不可约表示的共轭类的空间ε %(2)定义的(见[1])。这个不变量A(2)可以从2的外科手术或Heegard描述中计算出来,并且满足A(2)= JU(2)(mod 2),其中f i(2)是2的Kervaire-Milnor-Rochlin不变量。这个强大的新不变量被用来解决3-流形拓扑中的一个突出问题;即,证明如果2是同伦3-球面,则ju(2)= O。C. Taubes [17],利用规范理论的考虑,重新解释了卡森不变量的平坦连接。改进这种方法,A。Floer [13]最近定义了2的另一个不变量,它的“瞬子同源性”,它采用具有自然Z 8-分级的阿贝尔群/*(2)的形式,这是A(2)的增强,因为
For an oriented integral homology 3-sphere 2, A. Casson has introduced an integer invariant A(2) that is defined by using the space £%(2) of conjugacy classes of irreducible representations of ^ ( 2 ) into SU(2) (see [1]). This invariant A(2) can be computed from a surgery or Heegard description of 2 and satisfies A(2) = JU(2) (mod 2), where /i(2) is the Kervaire-Milnor-Rochlin invariant of 2. This powerful new invariant was used to settle an outstanding problem in 3-manifold topology; namely, showing that if 2 is a homotopy 3-sphere, then ju(2) = O. C. Taubes [17], utilizing gauge-theoretic considerations, has reinterpreted Casson's invariant in terms of flat connections. Refining this approach, A. Floer [13] has recently defined another invariant of 2 , its 'instanton homology', which takes the form of an abelian group /*(2) with a natural Z8-grading that is an enhancement of A(2) in that