Tetsuhiro Moriyama (University of Tokyo, JSPS Research Fellow)
Title: On the configuration space of points and the Casson invariant

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Abstract:
In this talk, we will construct certain 4-manifold X by using the configuration space of points of an oriented closed homolology 3-sphere M and a trivialization of TM. The main theorem is that the signature of X is equal to the Casson invariant of M (up to multiplication by a constant).