Monday, December 4, 2017
5:00 pm
East Bridge 201

Caltech/USC/UCLA Joint Topology Seminar

Smooth structures, stable homotopy groups of spheres and motivic homotopy theory
Zhouli Xu, Department of Mathematics, MIT
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.
Contact Mathematics Department mathinfo@caltech.edu at 626-395-4335
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