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Speaker: Yi Lai (Stanford University)

Title: O(2)-symmetry of 3D steady gradient Ricci solitons.

Abstract:  For any 3D steady gradient Ricci soliton, if it is asymptotic to a ray we prove that it must be isometric to the Bryant soliton. Otherwise, it is asymptotic to a sector and called a flying wing. We show that all flying wings are O(2)-symmetric. Hence, all 3D steady gradient Ricci solitons are O(2)-symmetric.

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