# Online: Seminar, Liang Kong (SIQSE), On the Classification of Topological Orders with Finite Internal Symmetries #### calendar\_today Date and Time **November 3, 2020** 10:00AM - 10:00AM EST #### pin\_drop Location **Zoom** ![Liang Kong](/sites/g/files/omnuum6611/files/styles/hwp_1_1__360x360_scale/public/mathpicture/files/kong.png?itok=X67FSJNT) **Location:** Zoom **Time CHANGE:** Tuesday, November 3, 2020, 10:00 AM (Eastern US), 15:00 (UK/Eire), 16:00 (Central Europe), 23:00 (China) **Title:** On the Classification of Topological Orders with Finite Internal Symmetries **Abstract:** In this talk, I present recent joint work with Tian Lan, Xiao-Gang Wen, Zhi-Hao Zhang and Hao Zheng (arXiv:2003.08898). We propose a mathematical theory of symmetry protected trivial (SPT) order, and of anomaly-free symmetry enriched topological (SET) order in all dimensions. We employ two different approaches (with an emphasis on the second one). Our first approach relies on gauging the symmetry. Our second approach relies on a boundary-bulk relation. We conjecture the equivalence of these two approaches, yielding a number of interesting mathematical conjectures. **Additional Ways to Join** Join by telephone (use any number to dial in) +1 929 436 2866 +1 312 626 6799 +1 669 900 6833 400 669 9381 China Toll-free International numbers available: [https://harvar](https://harvard.zoom.us/u/aclg6kOggb)[d.zoom.us/u/aclg6kOggb](https://harvard.zoom.us/u/aclg6kOggb) One tap mobile: +19294362866,,779283357# US (New York) Join by SIP conference room system Meeting ID: 779 283 357 <779283357@zoomcrc.com> **Attachments** --- Attachments- [ picture\_as\_pdf Flyer.pdf ](/sites/g/files/omnuum6611/files/mathpicture/files/liang_kong_seminar_nov_3_2020.pdf) --- Share on:- [ Facebook ](#) - [ Twitter ](#) - [ Linkedin ](#) Save: [ Add to calendar calendar\_today ](https://mathpicture.fas.harvard.edu/node/1535688/event-feed.ics) Copy link link