Flexible affine cones and flexible coverings
arXiv:1612.01144 · doi:10.1007/s00209-018-2069-2
Abstract
We provide a new criterion for flexibility of cones over varieties covered by flexible affine varieties. We apply this criterion to prove flexibility of affine cones over secant varieties of Segre--Veronese embeddings and over certain Fano threefolds. We further prove flexibility of total coordinate spaces of Cox rings of del Pezzo surfaces.
19 pages