## Seminars and Colloquium

#### Daniel Forger (Department of Mathematics, University of Michigan)Math Biology

Three mathematical problems arising from studying daily rhythms with smartphones and wearables

#### Yong-Gyu Choi (KAIST)Etc.

Quillen's higher algebraic $K$-theory I

#### Eun Jae Park (Yonsei University)Colloquium

Staggered Galerkin Method: A New Computational Paradigm

#### WonTae Hwang (KIAS)Number Theory Seminar

Automorphism groups of simple polarized abelian varieties of prime dimension over finite fields

#### Donghwan Kim (Department of Mathematical Sciences, KAIST)Colloquium

Accelerated First-Order Methods for Large-Scale Optimization

#### Yong-Gyu Choi (KAIST)Etc.

Quillen's higher algebraic $K$-theory II

#### Jae Hyouk Lee (Department of Mathematics, Ewha Womans University)Colloquium

Isoparametric Hypersurfaces and Minimal Lagrangian Submanifolds

## 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

Suppose that \( T \) is an \( N \times N \) matrix
\[
T = \begin{pmatrix}
a_1 & b_1 & 0 & \cdots & 0 \\
b_1 & a_2 & b_2 & \ddots & \vdots \\
0 & b_2 & a_3 & \ddots & 0 \\
\vdots & \ddots & \ddots & \ddots & b_{N-1} \\
0 & \cdots & 0 & b_{N-1} & a_N
\end{pmatrix}
\]
with \( b_i > 0 \) for \( i =1, 2, \dots, N-1 \). Prove that \( T \) has \( N \) distinct eigenvalues.