On sections of commutative group schemes
On semialgebraic points of definable sets
We prove that the semialgebraic, algebraic, and algebraic nonsingular points of a definable set in o-minimal structure with analytic cell decomposition are definable. Moreover, the operation of taking semialgebraic points is idempotent and the degree of complexity of semialgebraic points is bounded.
On semi-invariants of tilted algebras of type Aₙ
We prove that for algebras obtained by tilts from the path algebras of equioriented Dynkin diagrams of type Aₙ, the rings of semi-invariants are polynomial.
On seminormal schemes
On set theoretic complete intersections in IP3.
On set theoretic complete intersections in IP3 (Erratum).
On set theoretic complete intersections in P3k.
On simple fibered knots in S5 and the existence of decomposable algebraic 3-knots.
On simple germs with non-isolated singularities.
On simple Igusa local zeta functions.
On Singular Complex Surfaces with Negative Canonical Bundle, with Applications to Singular Compactifications of C2 and to 3-Dimensional Rational Singularities.
On singular complex surfaces with vanishing geometric genus, and pararational singularities
On singular moduli.
On singularities arising from the contraction of the minimal section a a ruled surface.
On Singularities in the Classification Theory of Algebraic Varieties.
On Singularities of Smooth Maps to a Space with a Fixed Cone.
On Singularities of the Curves Belonging to some linear system in P2.
On SL(2)-actions without 3-dimensional orbits
On smooth curves passing through rational surface singularities.
On smooth surfaces in Gr(1, P3) with a fundamental curve.