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Displaying 2461 – 2480 of 4977

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Module d’Alexander et représentations métabéliennes

Hajer Jebali (2008)

Annales de la faculté des sciences de Toulouse Mathématiques

On sait, depuis des travaux de Burde et de Rham, que l’étude des représentations du groupe d’un nœud dans le groupe des matrices triangulaires supérieures inversibles d’ordre 2 permet de détecter les racines du polynôme d’Alexander du nœud. Dans ce travail, nous nous proposons de généraliser ce résultat et ce en considérant les représentations du groupe du nœud dans le groupe des matrices triangulaires supérieures inversibles d’ordre n , n 2 . Cette approche nous permettra de retrouver la décomposition...

Module derivations and cohomological splitting of adjoint bundles

Akira Kono, Katsuhiko Kuribayashi (2003)

Fundamenta Mathematicae

Let G be a finite loop space such that the mod p cohomology of the classifying space BG is a polynomial algebra. We consider when the adjoint bundle associated with a G-bundle over M splits on mod p cohomology as an algebra. In the case p = 2, an obstruction for the adjoint bundle to admit such a splitting is found in the Hochschild homology concerning the mod 2 cohomologies of BG and M via a module derivation. Moreover the derivation tells us that the splitting is not compatible with the Steenrod...

Moduli Spaces of PU ( 2 ) -Instantons on Minimal Class VII Surfaces with b 2 = 1

Konrad Schöbel (2008)

Annales de l’institut Fourier

We describe explicitly the moduli spaces g pst ( S , E ) of polystable holomorphic structures with det 𝒦 on a rank two vector bundle E with c 1 ( E ) = c 1 ( K ) and c 2 ( E ) = 0 for all minimal class VII surfaces S with b 2 ( S ) = 1 and with respect to all possible Gauduchon metrics g . These surfaces S are non-elliptic and non-Kähler complex surfaces and have recently been completely classified. When S is a half or parabolic Inoue surface, g pst ( S , E ) is always a compact one-dimensional complex disc. When S is an Enoki surface, one obtains a complex disc with finitely...

Moment-angle complexes from simplicial posets

Zhi Lü, Taras Panov (2011)

Open Mathematics

We extend the construction of moment-angle complexes to simplicial posets by associating a certain T m-space Z S to an arbitrary simplicial poset S on m vertices. Face rings ℤ[S] of simplicial posets generalise those of simplicial complexes, and give rise to new classes of Gorenstein and Cohen-Macaulay rings. Our primary motivation is to study the face rings ℤ[S] by topological methods. The space Z S has many important topological properties of the original moment-angle complex Z K associated to...

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