Semisimple group actions on the three dimensional affine space are linear.
Semi-stability and heights of cycles.
Semistability of certain bundles on a quintic Calabi-Yau threefold.
Semistability of Frobenius direct images over curves
Let be a smooth projective curve of genus defined over an algebraically closed field of characteristic . Given a semistable vector bundle over , we show that its direct image under the Frobenius map of is again semistable. We deduce a numerical characterization of the stable rank- vector bundles , where is a line bundle over .
Semi-stability of reductive group schemes over curves.
Semi-Stable Curves on Algebraic Surfaces and Logarithmic Pluricanonical Maps.
Semistable reduction and torsion subgroups of abelian varieties
The main result of this paper implies that if an abelian variety over a field has a maximal isotropic subgroup of -torsion points all of which are defined over , and , then the abelian variety has semistable reduction away from . This result can be viewed as an extension of Raynaud’s theorem that if an abelian variety and all its -torsion points are defined over a field and , then the abelian variety has semistable reduction away from . We also give information about the Néron models...
Semistable Sheaves and Comparison Isomorphisms in the Semistable Case
Semistable Sheaves on Projective Varieties and Their Restriction to Curves.
Semistable vector bundles on Mumford curves.
Separable Algebren über kommutativen Ringen.
Separably Real Closed Local Rings.
Separating families for semi-algebraic sets.
Separating ideals in dimension 2.
Experience shows that in geometric situations the separating ideal associated with two orderings of a ring measures the degree of tangency of the corresponding ultrafilters of semialgebraic sets. A related notion of separating ideals is introduced for pairs of valuations of a ring. The comparison of both types of separating ideals helps to understand how a point on a surface is approached by different half-branches of curves.
Separation, factorization and finite sheaves on Nash manifolds
Separation of global semianalytic sets
Given global semianalytic sets A and B, we define a minimal analytic set N such that Ā∖N and B̅∖N can be separated by an analytic function. Our statement is very similar to the one proved by Bröcker for semialgebraic sets.
Separation of variables and the geometry of Jacobians.
Separeted orbits for certain non-reductive subgroups.
Sequences of rational torsions on abelian varieties.
Série de Poincaré pour certaines courbes