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[External Email] Dear all, Please be informed of the new Zoom Algebraic Geometry (ZAG) Seminar that meets on Tuesdays and Thursday. Details can be found athttps://www.maths.ed.ac.uk/cheltsov/zag/ I invite those interested to join the mailing list found on that website for future announcements and passwords. Kind regards, Julius Ross Associate Professor MSCS, UIC _____ 5 May 2020 (Tuesday), 15:00 GMT Chen Jiang (Fudan University, China) Title: Minimal log discrepancies of 3-dimensional non-canonical singularities Abstract: Canonical and terminal singularities, introduced by Reid, appear naturally in minimal model program and play important roles in the birational classification of higher dimensional algebraic varieties. Such singularities are well-understood in dimension 3, while the property of non-canonical singularities is still mysterious. We investigate the difference between canonical and non-canonical singularities via minimal log discrepancies (MLD). We show that there is a gap between MLD of 3-dimensional non-canonical singularities and that of 3-dimensional canonical singularities, which is predicted by a conjecture of Shokurov. This result on local singularities has applications to global geometry of Calabi–Yau 3-folds. We show that the set of all non-canonical klt Calabi–Yau 3-folds are bounded modulo flops, and the global indices of all klt Calabi–Yau 3-folds are bounded from above. Zoom:https://us02web.zoom.us/j/9918493831?pwd=YTRnQ25hK0pQcDcvNHkxekp4Wk50UT09 ID: 991 849 3831 Password: ChenAndSam Host: Ivan Cheltsov [[log in to unmask]]; 7 May 2020 (Tuesday), 18:00 GMT Samuel Grushevsky (Stony Brook University) Host: Ivan Cheltsov [[log in to unmask]]; Title: Geometry of moduli of cubic threefolds Abstract: The moduli space of cubic threefolds can be thought of as a GIT quotient of the projective space of all cubic polynomials, studied via the period map to a ball quotient, or via the intermediate Jacobians. We describe the relations between various compactifications of the moduli space of cubic threefolds that arise in these ways, and compute their cohomology. Based on joint works with S. Casalaina-Martin, K. Hulek, R. Laza. Zoom:https://us02web.zoom.us/j/9918493831?pwd=YTRnQ25hK0pQcDcvNHkxekp4Wk50UT09 ID: 991 849 3831 Password: ChenAndSam Please join Zoom meetings with your first and last name, and mute your microphone. Please do not share the passwords and zoom links in social media to avoid Zoom bombing. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message was sent to you via the Geometry List, which announces conferences in geometry and closely related areas to over 1600 mathematicians worldwide. At http://listserv.utk.edu/archives/geometry.html there are many functions available, including checking the archives since November 2005, changing your e-mail address or preferences, and joining/leaving the list. If you have problems that cannot be resolved at this website, send a message to [log in to unmask] Before sending an announcement, please carefully read the following. Any announcements that are *not* about conferences (e.g. those about jobs, journals, books, etc.) will be rejected by the moderator without comment. To announce a geometry or closely related conference, send the announcement (including a conference web site if possible) to [log in to unmask] The moderator cannot edit your message; list members will receive the announcement as an e-mail from you EXACTLY as you submitted it. For example, if your submission starts with "Please post this on the geometry list" then your conference announcement will also begin with that statement. In order to keep down the volume of e-mail, only TWO announcements per conference will be approved by the moderator. The "subject" of your message should include the name of the conference and the number (first or second) of the announcement, e.g. Gauss Memorial Lectures in Geometry: Second Announcement. Please check that your announcement (especially the website) is correct. Corrections will be approved only in the most critical situations, e.g. if corrected information is not available on the website. After submitting an announcement you may receive a message asking you to confirm your submission. This feature is designed to thwart the hundreds of machine-generated spam that are sent to the list and would otherwise have to be manually blocked by the moderator. If you do not see your announcement within 48 hours, please check the archives to see whether it was actually posted (i.e. you somehow missed seeing the post or are not subscribed with your current email address). If the announcement is not in the archive, search for a confirmation message that you may have missed (from listserv.utk.edu). If none of this solves the mystery, send a message to [log in to unmask] The Geometry List is sponsored and maintained by the Mathematics Department, The University of Tennessee, Knoxville.