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学术科研

Geometry & Topology Seminar

Smooth structures, stable homotopy groups of spheres and motivic homotopy theory

演讲者：徐宙利 (麻省理工大学)
时间：2018-01-09 16:30-17:30
地点：慧园3栋 415报告厅

Following Kervaire-Milnor, Browder and Hill-Hopkins-Ravenel, Guozhen Wang and I showed that the 61-sphere has a unique smooth structure and is the last odd dimensional case: S^1, S^3, S^5 and S^61 are the only odd dimensional spheres with a unique smooth structure. The proof is a computation of stable homotopy groups of spheres. We introduce a method that computes differentials in the Adams spectral sequence by comparing with differentials in the Atiyah-Hirzebruch spectral sequence for real projective spectra through Kahn-Priddy theorem. I will also discuss recent progress of computing stable stems using motivic homotopy theory with Dan Isaksen and Guozhen Wang.