Représentations exceptionnelles des groupes semi-simples
Rings of Invariants and Linkage of Determinantal Ideals.
Robust decoupling through algebraic output feedback in manipulation systems
This paper investigates the geometric and structural characteristics involved in the control of general mechanisms and manipulation systems. These systems consist of multiple cooperating linkages that interact with a reference member of the mechanism (the “object”) by means of contacts on any available part of their links. Grasp and manipulation of an object by the human hand is taken as a paradigmatic example for this class of manipulators. Special attention is devoted to the output specification...
Semisimple group actions on the three dimensional affine space are linear.
Separeted orbits for certain non-reductive subgroups.
Singular principal -bundles on nodal curves
In the present paper, we give a first general construction of compactified moduli spaces for semistable -bundles on an irreducible complex projective curve with exactly one node, where is a semisimple linear algebraic group over the complex numbers.
Singularities of Quotients by Vector Fields in Characteristic p.
Some moduli spaces of smooth complete intersections which are quasi-projective
For some values of the degrees of the equations, we show, using geometric invariant theory, that the coarse moduli space of smooth complete intersections in is quasi-projective.
Stability of meromorphic vector fields in projective spaces.
Stability of pencils of plane quartic curves
In questa nota si danno dei criteri per la stabilità di fasci di quartiche piane.
Stability of Two-Dimensional Local Rings. I.
Stable affine models for algebraic group actions.
Stable rationality of certain PGLn-quotients.
Stable Vector Bundles of Rank 2 on IP3.
Sur le théorème de Hilbert différentiable pour les groupes linéaires finis (d'après E. Noether)
Sur les invariants des pinceaux de formes quintiques binaires
On décrit l’algèbre des invariants de l’action naturelle du groupe sur les pinceaux de formes quintiques binaires.
The cohomology of period domains for reductive groups over finite fields
The Ehrhart polynomial of a lattice -simplex.
The ideal of relations for the ring of invariants of points on the line
The ring of projective invariants of ordered points on the projective line is one of the most basic and earliest studied examples in Geometric Invariant Theory. It is a remarkable fact and the point of this paper that, unlike its close relative the ring of invariants of unordered points, this ring can be completely and simply described. In 1894 Kempe found generators for this ring, thereby proving the First Main Theorem for it (in the terminology introduced by Weyl). In this paper we compute...
The index of centralizers of elements of reductive Lie algebras.