On the cone of effective 2-cycles on ${\overline{M}}_{0,7}$

Luca Schaffler

Fulton's question about effective $k$-cycles on ${\overline{M}}_{0,n}$ for $1<k<n-4$ can be answered negatively by appropriately lifting to ${\overline{M}}_{0,n}$ the Keel-Vermeire div…