Spectre irréductible d'un module.
Spezielle Algebren und transitive Operationen.
Spherical Complexes and Nonprojective Tone Varieties.
Spherical conjugacy classes and the Bruhat decomposition
Let be a connected, reductive algebraic group over an algebraically closed field of zero or good and odd characteristic. We characterize spherical conjugacy classes in as those intersecting only Bruhat cells in corresponding to involutions in the Weyl group of .
Spherical roots of spherical varieties
Brion proved that the valuation cone of a complex spherical variety is a fundamental domain for a finite reflection group, called the little Weyl group. The principal goal of this paper is to generalize this theorem to fields of characteristic unequal to 2. We also prove a weaker version which holds in characteristic 2, as well. Our main tool is a generalization of Akhiezer’s classification of spherical varieties of rank 1.
Spherical spaces for which the Hasse principle and weak approximation fail.
We construct spherical homogeneous spaces X of semisimple simply connected groups with connected stabilizers such that the Hasse principle or weak approximation fail for X.
Spherical varieties and Wahl’s conjecture
Using the theory of spherical varieties, we give a type independent very short proof of Wahl’s conjecture for cominuscule homogeneous varieties for all primes different from 2.
Spin groups over a commutative ring and the associated root data (odd rank case).
Spitzen, Doppelpunkte und vertikale Tangenten in der Diskriminante verseller Deformationen von vollständigen Durchschnitten.
Splitting monads of vector bundles.
Splitting vector bundles by blowups
We show some advantages of splitting vector bundles by blowups.
Sporadic cycles on CM abelian varieties
Springer fiber components in the two columns case for types and are normal
We study the singularities of the irreducible components of the Springer fiber over a nilpotent element with in a Lie algebra of type or (the so-called two columns case). We use Frobenius splitting techniques to prove that these irreducible components are normal, Cohen–Macaulay, and have rational singularities.
Springer's Weyl Group Representations Through Characteristc Classes of Cone Bundles.
Stabile reflexive Garben vom Rang 3 auf P3 mit kleinen Chernklassen.
Stabilité de l'holonomie sans structure de Frobenius : cas des courbes
Stabilité des fibrés et condition de Raynaud
Stabilité du fibré tangent des surfaces de Del Pezzo.
Stability and equivariant maps.
Stability index of real varieties.