NONTRIVIAL CLASSES IN H*(Imb(S1,ℝn)) FROM NONTRIVALENT GRAPH COCYCLES
NONTRIVIAL CLASSES IN H*(Imb(S1,ℝn)) FROM NONTRIVALENT GRAPH COCYCLES
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非三价图环中的 H*(Imb(S1,ℝn)) 中的非三类
DOI:
10.1142/s0219887804000320
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发表时间:
2004
影响因子:
1.8
通讯作者:
Riccardo Longoni
中科院分区:
文献类型:
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作者:
Riccardo Longoni
We construct nontrivial cohomology classes of the space Imb(S1,ℝn) of imbeddings of the circle into ℝn by means of Feynman diagrams. More precisely, starting from a suitable linear combination of nontrivalent diagrams, we construct, for every even number n≥4, a de Rham cohomology class on Imb(S1,ℝn). We prove nontriviality of these classes by evaluation on the dual cycles.