In this paper, we establish a relationship between fractional Dehn twist coefficients of Riemann surface automorphisms a......

We survey various generalizations of braid groups for quivers with superpotential and focus on the cluster braid groups,......

设J是Hopf代数的扭，本文研究由J所定义的H-模余代数C^J．主要证明了如果J和△（h）交换，那么Hopf模范畴MH^C异同构于MH^CJ；C^MH同构于C^JMH．......

本文综述了双三次曲面片角点扭矢的各种计算方法。...