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Harder-Narasimhan filtrations and optimal destabilizing vectors in complex geometry

Laurent Bruasse, Andrei Teleman (2005)

Annales de l’institut Fourier

We give here a generalization of the theory of optimal destabilizing 1-parameter subgroups to non algebraic complex geometry : we consider holomorphic actions of a complex reductive Lie group on a finite dimensional (possibly non compact) Kähler manifold. In a second part we show how these results may extend in the gauge theoretical framework and we discuss the relation between the Harder-Narasimhan filtration and the optimal detstabilizing vectors of a non semistable object....

Homogeneous polynomials with isomorphic Milnor algebras

Imran Ahmed (2010)

Czechoslovak Mathematical Journal

We recall first Mather's Lemma providing effective necessary and sufficient conditions for a connected submanifold to be contained in an orbit. We show that two homogeneous polynomials having isomorphic Milnor algebras are right-equivalent.

Hyperdéterminant d’un S L 2 -homomorphisme

Jean Vallès (2008)

Annales mathématiques Blaise Pascal

Etant donnés A 1 , ⋯ , A s ( s ≥ 3 ) des S L 2 ( ℂ ) -modules non triviaux de dimensions respectives n 1 + 1 ≥ ⋯ ≥ n s + 1 (avec n 1 = n 2 + ⋯ + n s ) et φ ∈ ℒ ( A 2 ⊗ ⋯ ⊗ A s , A 1 * ) un S L 2 ( ℂ ) -homomorphisme, nous montrons que l’hyperdéterminant de φ est nul sauf si les modules A i sont irréductibles et si l’homomorphisme est la multiplication des polynômes homogènes à deux variables.

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