## May 2022

### Stijn Cambie, The precise diameter of reconfiguration graphs

Room B332 IBS (기초과학연구원)

Reconfiguration is about changing instances in small steps. For example, one can perform certain moves on a Rubik's cube, each of them changing its configuration a bit. In this case,

### Sebastian Siebertz, Transducing paths in graph classes with unbounded shrubdepth

Zoom ID: 869 4632 6610 (ibsdimag)

Transductions are a general formalism for expressing transformations of graphs (and more generally, of relational structures) in logic. We prove that a graph class C can be FO-transduced from a

### Hongseok Yang (양홍석), Learning Symmetric Rules with SATNet

Room B332 IBS (기초과학연구원)

SATNet is a differentiable constraint solver with a custom backpropagation algorithm, which can be used as a layer in a deep-learning system. It is a promising proposal for bridging deep

## June 2022

### Jeck Lim, Sums of linear transformations

Zoom ID: 870 0312 9412 (ibsecopro)

We show that if $L_1$ and $L_2$ are linear transformations from $\mathbb{Z}^d$ to $\mathbb{Z}^d$ satisfying certain mild conditions, then, for any finite subset $A$ of $\mathbb{Z}^d$, \ This result corrects

### O-joung Kwon (권오정), Graph minor theory and beyond

Room 1501, Bldg. E6-1, KAIST

One of the important work in graph theory is the graph minor theory developed by Robertson and Seymour in 1980-2010. This provides a complete description of the class of graphs

### Amadeus Reinald, Twin-width and forbidden subdivisions

Room B332 IBS (기초과학연구원)

Twin-width is a recently introduced graph parameter based on vertex contraction sequences. On classes of bounded twin-width, problems expressible in FO logic can be solved in FPT time when provided

### Chengfei Xie, On the packing densities of superballs in high dimensions

Zoom ID: 870 0312 9412 (ibsecopro)

The sphere packing problem asks for the densest packing of nonoverlapping equal-sized balls in the space. This is an old and difficult problem in discrete geometry. In this talk, we

### Ben Lund, Radial projections in finite space

Room B332 IBS (기초과학연구원)

Given a set $E$ and a point $y$ in a vector space over a finite field, the radial projection $\pi_y(E)$ of $E$ from $y$ is the set of lines that

### Xizhi Liu, Hypergraph Turán problem: from 1 to ∞

Zoom ID: 870 0312 9412 (ibsecopro)

One interesting difference between (nondegenerate) Graph Turán problem and Hypergraph Turán problem is that the hypergraph families can have at least two very different extremal constructions. In this talk, we

## July 2022

### Eric Vigoda, Computational phase transition and MCMC algorithms

Room B332 IBS (기초과학연구원)

This talk will highlight recent results establishing a beautiful computational phase transition for approximate counting/sampling in (binary) undirected graphical models (such as the Ising model or on weighted independent sets). The computational problem is to

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