# Upcoming Events

## December 2019

### Speaker

Let ${\mathcal{M} = (M_i \colon i\in K)}$ be a finite or infinite family consisting of finitary and cofinitary matroids on a common ground set $E$. We prove the following Cantor-Bernstein-type result: if $E$ can be covered by sets ${(B_i \colon i\in K)}$ which are bases in the corresponding matroids and there are also pairwise disjoint bases of the matroids $M_i$ then $E$ can be partitioned into bases with respect to $\mathcal{M}$.

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### Speaker

To an abelian category A satisfying certain finiteness conditions, one can associate an algebra H_A (the Hall algebra of A) which encodes the structures of the space of extensions between objects in A. For a non-additive setting, Dyckerhoff and Kapranov introduced the notion of proto-exact categories, as a non-additive generalization of an exact category, which is shown to suffice for the construction of an associative Hall algebra. In this talk, I will discuss the category of matroids in this perspective.

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## June 2020

### Seymour is Seventy

A conference honouring the seventieth birthday of Paul Seymour To be held in ENS de Lyon, France, June 15 - 19, 2020 Conference Website: https://dimag.ibs.re.kr/seymour70/ Sponsors: IBS Discrete Mathematics Group. LIP, ENS de Lyon, France. Department of Mathematics, Princeton University.

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## August 2020

### 2020 IBS workshop on Extremal and Probabilistic Combinatorics

Date August 24, 2020 - August 28, 2020 Arrival: August 23 Sunday. Departure: August 29, Saturday Venue Room B109, Institute for Basic Science,  55 Expo-ro, Yuseong-gu, Daejeon, South Korea Invited Speakers To be announced. Accommodation Lotte City Hotel and Hotel ICC are within 700m. Invited speakers will be provided an accommodation at the near-by hotels. Organizers Mihyun Kang, Graz University of Technology, Austria. Jaehoon Kim, KAIST, Korea. Sang-il Oum, IBS Discrete Mathematics Group, Korea and KAIST, Korea.

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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