Norihisa Teshigawara (Tokyo Institute of Technology)
Title: On the Khovanov invariant for links

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Abstract:
In 1999, M.Khovanov constructed an invariant of oriented links. It is a family of (co)homology groups whose graded Euler characteristic is the Jones polynomial. Though his definition is algebraically very complicated, O.Viro simplified it in 2002. In this talk, I will introduce the Khovanov invariant defined by O. Viro and report its related topics.