BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Sira Gratz (Aarhus University\, Denmark) DTSTART:20251105T130000Z DTEND:20251105T140000Z DTSTAMP:20260423T041622Z UID:LAGOON/106 DESCRIPTION:Title: An equivalence of graded hypersurface singularities of infinite type A an d D\nby Sira Gratz (Aarhus University\, Denmark) as part of Longitudin al Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nThe on e-dimensional hypersurface singularities of countably infinite Cohen–Mac aulay type are precisely those of infinite type A and D. They are the infi nite analogues of simple plane curve singularities\, which have finite Coh en–Macaulay type and are classified by the finite ADE diagrams. From a c luster theoretic perspective\, it is natural to study these\, and related\ , singularities with a specific grading. This was pioneered in work by Jen sen\, King and Su for the finite rank case. We explain how to translate th is idea to the infinite rank case\, and conclude with a surprising observa tion: Under this grading\, we find a stable equivalence of graded Cohen– Macaulay modules for the hypersurface singularities of infinite types A an d D. This talk is based on two WINART projects\, the first joint with Augu st\, Cheung\, Faber and Schroll and the second joint with Cummings\, Kirkm an\, Letz\, Rock and Špenko.\n\nhttps://uni-koeln.zoom.us/j/91875528987?p wd=US8wdjNrWjl5dXNQSVRzREhoRE1PUT09\n\nMeeting ID: 918 7552 8987\nPassword : LAGOON\n LOCATION:https://researchseminars.org/talk/LAGOON/106/ END:VEVENT END:VCALENDAR