# Geometrical structures in 4d N=2 class S theories

### APA

Yan, F. (2022). Geometrical structures in 4d N=2 class S theories. Perimeter Institute. https://pirsa.org/22060073

### MLA

Yan, Fei. Geometrical structures in 4d N=2 class S theories. Perimeter Institute, Jun. 23, 2022, https://pirsa.org/22060073

### BibTex

@misc{ pirsa_PIRSA:22060073, doi = {10.48660/22060073}, url = {https://pirsa.org/22060073}, author = {Yan, Fei}, keywords = {Mathematical physics}, language = {en}, title = {Geometrical structures in 4d N=2 class S theories}, publisher = {Perimeter Institute}, year = {2022}, month = {jun}, note = {PIRSA:22060073 see, \url{https://pirsa.org}} }

Rutgers University

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Abstract

I will give an introduction to 4d N=2 class-S theories. I will describe the construction of such theories, the roles played by extended defects such as line defects and surface defects, as well as connections to Hitchin systems.