北京快三近200期走势图

圖與組合系列講座之四十一(Andrey Vasilyev)

發布時間:2019-04-04作者:訪問量:10

報告題目: The 2-closure of permutation groups and the isomorphism problem for schurian coherent configurations

報 告 人: Andrey Vasilyev (索博列夫數學研究所&新西伯利亞州立大學,俄羅斯)

報告時間: 2019412(周五)下午1630

報告地點: 磬苑校區數學科學學院 H 306

歡迎各位老師、同學屆時前往!

  

科學技術處

201944

報告摘要:

    Starting in the late 1960s, the theory of coherent configurations has now become one of the central parts of algebraic combinatorics. The main goal of this theory is to provide a common method to study symmetries of combinatorial objects. So it is not surprising that permutation groups provide a rich source of coherent configurations. In fact, there is a natural Galois correspondence between subgroups of symmetric group on a set Ωand coherent configurations defined on  Ω. The closed objects with respect to that correspondence are 2-closed permutation groups and schurian coherent configurations. In this talk we concentrate on the isomorphism problem for two important classes of schurian coherent configurations: 3/2-homogeneous and of rank 3.

  


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