Virtual Seminar on 

Geometry and Topology

https://sites.google.com/view/visgat

Organizer

Hyungryul Baik (KAIST), Sang-hyun Kim (KIAS)

How to join

Zoom

Meeting room 861 2351 2846

Password 7998

Time Generally, Tuesday morning 10 am in KST, but individual schedules may vary

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

2023 Fall

September 19, 20 (Tue/Wed), 2023 at 10 - 11:30 am

(Joint with KIAS--Springer Lecture Series)

Online http://kimsh.kr/vz

In person KIAS (1423)

Poster

Andrés Navas (Universidad de Santiago de Chile)

(Arc)-connectedness of the space of Z^d actions on 1-manifolds.

We will elaborate on two recent results obtained in collaboration with Hélène Eynard-Bontemps  (Inst. Fourier, Grenoble): 

- The space of Z^d actions by C^{1+ac} diffeomorphisms of a compact 1-manifold is path-connected;

- The space of Z^d actions by C^2 diffeomorphisms of the interval is connected.

Here, "ac" stands for absolutely continuous. I will deeply comment on several technical problems when dealing with these properties: Mather's homomorphisms, failure of Sternberg's linearization theorem, etc. Several questions will be addressed along the two lectures.

September 26, 2023 (Tue), 2023 at 10 am

Online http://kimsh.kr/vz

In person KIAS (1423)

Cristóbal Rivas (Universidad de Chile)

Regular orders on groups

I will discuss some recent results regarding the language complexity of (left) orders on groups. I'll focus on examples of groups having/not having positive cones that can/cannot be described by a regular language.

Nov 2, 2023 (Th), 2023 at 10 am

Note the date!

Online http://kimsh.kr/vz

In person KIAS (1423)

Robert Tang (Xi’an Jiaotong-Liverpool University)

TBA

TBA

November 23, 2023 (Thursday) at 10 am

Note the date!

Online http://kimsh.kr/vz

In person KIAS (1423)

James Rickards (Colorado)

TBA

TBA

TBA (2023): Ser Peow Tan, Ken'ichi Ohshika, Jason Behrstock

2024

March 27, 29, 2023 (Tue/Thur) 2023 at 10 am (TENTATIVE)

Michele Triestino (Université de Bourgogne)

TBA

TBA



Organizers

Harry Hyungryul Baik (KAIST)

Sam Sang-hyun Kim (KIAS)

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