# Online: Seminar, Stefaan Vaes (Katholieke Universiteit Leuven), W\*-rigidity Paradigms for Embeddings of II₁ Factors #### calendar\_today Date and Time **February 2, 2021** 10:00AM - 10:00AM EST #### pin\_drop Location **Zoom** ![Stefaan Vaes](/sites/g/files/omnuum6611/files/styles/hwp_1_1__720x720_scale/public/mathpicture/files/vaes.png?itok=8fnEeYhh) **Location:** Zoom **Time:** Tuesday, February 2, 2021, 10:00 AM (Eastern US), 15:00 (UK/Eire), 16:00 (Central Europe), 23:00 (China) **Title:** W\*-rigidity Paradigms for Embeddings of II₁ Factors **Abstract:** I will report on a recent joint work with Sorin Popa in which we undertake a systematic study of W\*-rigidity paradigms for the embedding relation between II₁ factors and their amplifications. We say that a II₁ factor M stably embeds into a II₁ factor N if M may be realized as a subfactor of an amplification of N, not necessarily of finite index. This is a preorder relation and we prove that it is as complicated as it can be: under the appropriate separability assumptions, we concretely realize any partially ordered set inside the preordered class of II₁ factors with embeddability. **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/vaes_seminar_feb_2_2021.pdf) --- Share on:- [ Facebook ](#) - [ Twitter ](#) - [ Linkedin ](#) Save: [ Add to calendar calendar\_today ](https://mathpicture.fas.harvard.edu/node/1564658/event-feed.ics) Copy link link