## Dabeen Lee (이다빈) presented his work on algorithmic problems of finding a clutter minor at the Discrete Math Seminar

On July 16, 2019, Dabeen Lee (이다빈) from IBS Discrete Mathematics Group presented his work on identifying a clutter minor related to ideal clutters at the Discrete Math Seminar. The title of his talk was “Integrality of set covering polyhedra and clutter minors”.

## Patrice Ossona de Mendez presented his work on the structural sparsity of graphs in terms of a model theoretic notion at the discrete math seminar

On June 25, 2019, Patrice Ossona de Mendez from CNRS, France presented a talk on the structural sparsity of graphs in terms of the model theoretic notion of first-order transduction. The title of his talk was “A model theoretical approach to sparsity”.

## Welcome Donggyu Kim (김동규), a new graduate student, and William Overman, a visiting undergraduate student in the IBS discrete mathematics group

The IBS discrete mathematics group welcomes two new students.

Donggyu Kim (김동규) is a new graduate student from July 2019 and is currently a graduate student at the department of mathematical sciences, KAIST.

William Overman is a visiting student from June 2019 to August 2019 and is currently an undergraduate student in California Institute of Technology. His research visit is sponsored by his home university.

## Suil O (오수일) presented his work on an upper bound of the 3rd largest eigenvalue of a regular graph to guarantee the existence of an odd (1,b)-factor at the discrete math seminar

On June 19, 2019, Suil O (오수일) from SUNY Korea, Incheon presented his work on an upper bound of the third largest eigenvalue of a connected r-regular graph to have an odd (1,b)-factor. The title of his talk was “An odd [1,b]-factor in regular graphs from eigenvalues”.

## Welcome Dabeen Lee (이다빈), a new research fellow in the IBS discrete mathematics group

The IBS discrete mathematics group welcomes Dr. Dabeen Lee (이다빈), a new research fellow at the IBS discrete mathematics group from June 2019.

He received his Ph.D. from the Program of Algorithms, Combinatorics, and Optimization at the Carnegie Mellon University under the supervision of Prof. Gérard P. Cornuéjols in 2019. Welcome!

## 2019 Combinatorics Workshop (2019 조합론 학술대회) will be held in Songdo, Incheon from August 13 to August 15, 2019

This year, 2019 Combinatorics Workshop (2019 조합론 학술대회) will be held in Songdo, Incheon from August 13, 2019 to August 15, 2019. This is an annual meeting of combinatorics people in Korea, started in 2004.

The list of major speakers includes Mihyun Kang from T. U. Graz and Jaehoon Kim from KAIST, Seung Jin Lee from Seoul National University, and Meesue Yoo from Dankook University.

The conference website is located on https://cw2019.combinatorics.kr/. Please register if you want to participate.

올해 2019 조합론 학술대회가 인천 송도에서 2019년 8월 13일부터 15일까지 열립니다. 이 행사는 2004년부터 시작된 한국 내 조합론 연구자들의 연례 미팅입니다.

이번의 주요 연사로는 오스트리아 Graz 공대의 강미현 교수, KAIST 김재훈 교수, 서울대 이승진 교수, 단국대 유미수 교수가 있습니다.

워크샵 홈페이지는 https://cw2019.combinatorics.kr/입니다. 참가를 원하시면 등록하시기 바랍니다.

## Jinyoung Park (박진영) presented her work on the number of maximal independent sets in the hypercube graph at the Discrete Math Seminar

On June 3, 2019, Jinyoung Park (박진영) from Rutgers University, USA presented her joint work with Jeff Kahn on the number of maximal independent sets in the hypercube graph at the Discrete Math Seminar. The title of her talk was “The maximal independent sets in the Hamming cube”.

## How to subscribe to the seminar schedule on your phone or the Google Calendar

Our website provides the iCal feed of all events, so that one can conveniently subscribe the schedule of seminars on smart phones, desktop calendar applications, and google calendar.

On the iOS (Apple iPhone or iPad) or the Apple MacOS, one can click the following link to subscribe the calendar on the device.

webcal://dimag.ibs.re.kr/events/?ical=1&tribe_display=list

On the Android Phone, we recommend to subscribe the calendar in the Google Calendar. To do so, click “+” after “Other calendars” and click “From URL (URL로 추가)” in the setting and type the following URL.

https://dimag.ibs.re.kr/events/?ical=1&tribe_display=list
기초과학연구원 수리및계산과학연구단 이산수학그룹
대전 유성구 엑스포로 55 (우) 34126
IBS Discrete Mathematics Group (DIMAG)
Institute for Basic Science (IBS)
55 Expo-ro Yuseong-gu Daejeon 34126 South Korea
E-mail: dimag@ibs.re.kr, Fax: +82-42-878-9209