20 Answers votes newest views recent 6When are Hilbert schemes smooth? 1Sections of a fibration in intersections of quadrics 10Relationship between Hilbert schemes and deformation spaces 5Rees algebra for non-radical ideals 4When can one extend a flat family from a subscheme to the whole scheme? 9Discriminant and Different. 3balanced curves in Calabi-Yau 3-folds 2Dual Curves in Fancy Language 20Why torsion is important in (co)homology ? 5What are non-trivial examples of non-singular blow-ups of a non-singular variety? 2Stacks determined by their coarse moduli spaces 4Functoriality of Hironaka’s resolution of singularities 2Positivity in stack geometry 10Italian school of algebraic geometry and rigorous proofs 9Why is the Euler characteristic of powers of a line bundle a polynomial in the power? (2) 5Algebraic stacks from scratch 1“Every scheme as a sheaf” references? 7functorial meaning of irreducibility of a moduli space 20Possible formal smoothness mistake in EGA 5Is an algebraic space group always a scheme?