##### Department of Mathematics,

University of California San Diego

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### Math 292 - Topology Seminar

## O\v{g}uz \c{S}avk

#### Bo\v{g}azi\c{c}i University

## Classical and new plumbings bounding contractible manifolds and homology balls

##### Abstract:

A central problem in low-dimensional topology asks which homology 3-spheres bound contractible 4-manifolds and homology 4-balls. In this talk, we address this problem for plumbed 3-manifolds and we present the classical and new results together. Our approach is based on Mazurâ€™s famous argument which provides a unification of all results in a fairly simple way.

Host: Jianfeng Lin

### May 18, 2021

### 11:30 AM

### Meeting ID: 933 6734 4286 Password: topology

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