## Seminars and Colloquium

#### Efim Zelmanov (UC San Diego and KIAS)Distinguished Scholar Lecture Series

Asymptotic Group Theory

#### Gang Tian (Peking U. and Princeton U.)Distinguished Scholar Lecture Series

Poincare Conjecture and Geometrization

#### Gang Tian (Peking U. and Princeton U.)Distinguished Scholar Lecture Series

Geometrization and curvature flows, I & II

#### Gang Tian (Peking U. and Princeton U.)Distinguished Scholar Lecture Series

Geometrization and curvature flows, I & II

#### Sang-hyun Kim (Seoul National University)Topology Seminar

Diffeomorphism groups of critical regularity

#### Yunjin Choi (National University of Singapore)MathSci Seminar

Selecting the number of principal components: estimation of the true rank of a noisy matrix

#### Yuichiro Taguchi (Department of Mathematics, Tokyo Institute of Tech)Colloquium

Mordell-Weil groups over moderately large number fields

## Conferences and Workshops

## Bookmarks

## Bulletin Boards

고페이 수학강사 모십니다. | 08. 11 | |

중3 수학 과외 선생님 모십니다. | 04. 06 | |

여학생 과외 원합니다. | 03. 07 | |

고교2학년생입니다. 수학선생님 원해요 | 11. 11 | |

대학원 입시 설명회 자료 좀 올려주시겠어요? | 06. 22 | |

모듈 형식과 타원 방정식에 대해서 질문합니다 | 11. 13 | |

모듈 형식과 타원 방정식에 대해서 질문합니다 | 11. 13 |

## Alumni News

## Problem of the week

Find all integers \( n \) such that \( \sqrt{1} + \sqrt{2} + \dots + \sqrt{n} \) is an integer.