Math Colloquia

1400

Date | May 06, 2021 |
---|---|

Speaker | 김상현 |

Dept. | 고등과학원 수학부 |

Room | 선택 |

Time | 16:00-17:00 |

※ 줌(zoom)

Zoom: https://snu-ac-kr.zoom.us/j/86735555642

회의 ID: 86735555642

For each natural number k, the C^k diffeomorphisms of the circle form a group with function compositions. This definition even extends to real numbers k no less than one by Hölder continuity. We survey algebraic properties of this group, many of which can distinguish various values of k. (Joint work with Thomas Koberda)

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