Organizers

Hyungryul Baik (KAIST), 

Inhyeok Choi, Sang-hyun Kim, Javier de la Nuez-González, Carl-Fredrik Nyberg-Brodda, David Xu (KIAS),

Sanghoon Kwak (SNU)

How to join

Zoom https://kimsh.kr/vz

Meeting ID: 822 3235 0014

Passcode: 7998

Time Generally, Tuesdays or Thursdays 11 am KST

Length is typically for one-hour unless noted otherwise, although it's often extended by questions etc.

Mailing list Please contact one of the organizers to subscribe.

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Jan 13 (Tue)  2 pm - 3 pm

KIAS (Room 1423) & Zoom https://kimsh.kr/vz

Javier de la Nuez-González (KIAS) 

Title: Sharply k-homogeneous actions on relational structures

Abstract: We say that an action by isomorphisms of a group G on a relational structure M is sharply k-homogeneous if for any two tuples of distinct elements of M, a and a', which are in the same orbit under the diagonal action of Aut(M) there is exactly one element g in G mapping a to a'. I will discuss recent work joint with Rob Sullivan in which we establish sufficient conditions for the existence of sharply k-homogeneous actions of finitely generated virtually free groups on relational Fräissé limits.

Jan 23 (Fri)  10 - 11:30 am

Zoom only https://kimsh.kr/vz

Nic Brody (UC Santa Barbara) 

Title: TBA

Abstract: TBA

Feb 23 (Mon) 5 pm - 6 pm

Location TBA | Zoom https://kimsh.kr/vz

Sangrok Oh (UPV/EHU) 

Title: Right-angled Artin groups in hierarchically hyperbolic groups

Abstract: Hierarchically hyperbolic groups form a broad class of groups characterized by axioms inspired by mapping class groups. In this talk, we will first show that any finite collection of elements in a mapping class group generates a right-angled Artin subgroup once taken to sufficiently large powers. We will then discuss how this phenomenon extends, under suitable assumptions, to the setting of hierarchically hyperbolic groups.