BEGIN:VCALENDAR VERSION:2.0 PRODID:-//hacksw/handcal//NONSGML v1.0//EN CALSCALE:GREGORIAN BEGIN:VEVENT LOCATION:Online DESCRIPTION:In 1998\, Goresky\, Kottwitz\, MacPherson introduced a class of $(S^1)^k$-actions on smooth manifolds with degenerate odd-dimensional cohomologies. They calculated the corresponding ring of equivariant cohomologies in terms of so-called GKM-graphs. Roughly speaking\, a GKM-graph of type $(n\,k)$ is an $n$-valent graph with labels from the lattice $\Z^k$ on its edges. DTSTART:20201127T180000Z DTEND:20201127T190000Z SUMMARY:Seminar “On the problem of maximal extension for GKM-graphs” URL;VALUE=URI:/media/events/seminar-on-the-problem-of-maximal-extension-for-gkm-graphs/ DTSTAMP:20250509T223148Z UID:681e58247a89d END:VEVENT END:VCALENDAR