Calculus of clovers and finite type invariants of 3–manifolds
Calculus of clovers and finite type invariants of 3–manifolds
复制标题
三叶草微积分和 3 流形的有限类型不变量
DOI:
10.2140/gt.2001.5.75
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发表时间:
2000
影响因子:
2
通讯作者:
M. Polyak
中科院分区:
文献类型:
--
作者:
S. Garoufalidis;M. Goussarov;M. Polyak
A clover is a framed trivalent graph with some additional structure, embedded in a 3{manifold. We dene surgery on clovers, generalizing surgery on Y{graphs used earlier by the second author to dene a new theory of nite-type invariants of 3{manifolds. We give a systematic exposition of a topological calculus of clovers and use it to deduce some important results about the corresponding theory of nite type invariants. In particular, we give a description of the weight systems in terms of uni-trivalent graphs modulo the AS and IHX relations, reminiscent of the similar results for links. We then compare several denitions of nite type invariants of homology spheres (based on surgery on Y{graphs, blinks, algebraically split links, and boundary links) and prove in a self-contained way their equivalence.