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Displaying 61 – 80 of 173

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Clifford approach to metric manifolds

Chisholm, J. S. R., Farwell, R. S. (1991)

Proceedings of the Winter School "Geometry and Physics"

[For the entire collection see Zbl 0742.00067.]For the purpose of providing a comprehensive model for the physical world, the authors set up the notion of a Clifford manifold which, as mentioned below, admits the usual tensor structure and at the same time a spin structure. One considers the spin space generated by a Clifford algebra, namely, the vector space spanned by an orthonormal basis { e j : j = 1 , , n } satisfying the condition { e i , e j } e i e j = e j e i = 2 I η i j , where I denotes the unit scalar of the algebra and ( η i j ) the nonsingular Minkowski...

Coalgebraic Approach to the Loday Infinity Category, Stem Differential for 2 n -ary Graded and Homotopy Algebras

Mourad Ammar, Norbert Poncin (2010)

Annales de l’institut Fourier

We define a graded twisted-coassociative coproduct on the tensor algebra the desuspension space of a graded vector space V . The coderivations (resp. quadratic “degree 1” codifferentials, arbitrary odd codifferentials) of this coalgebra are 1-to-1 with sequences of multilinear maps on V (resp. graded Loday structures on V , sequences that we call Loday infinity structures on V ). We prove a minimal model theorem for Loday infinity algebras and observe that the Lod category contains the L category as...

Cohomologie des algèbres de Lie croisées et K -théorie de Milnor additive

Daniel Guin (1995)

Annales de l'institut Fourier

Dans cet article, nous définissons des modules de (co)-homologie 0 ( 𝔊 , 𝔄 ) , 1 ( 𝔊 , 𝔄 ) , ( 𝔊 , 𝔄 ) , 1 ( 𝔊 , 𝔄 ) 𝔊 et 𝔄 sont des algèbres de Lie munies d’une structure supplémentaire (algèbres de Lie croisées), qui satisfont les propriétés usuelles des foncteurs cohomologiques. Si A est une k -algèbre, nous utilisons ces modules d’homologie pour comparer le groupe d’homologie cyclique H C 1 ( A ) avec un analogue additif du groupe de K -théorie de Milnor K 2 Madd ( A ) .

Cohomologie et K-théorie équivariantes des variétés de Bott-Samelson et des variétés de drapeaux

Matthieu Willems (2004)

Bulletin de la Société Mathématique de France

L’objet de cet article est de calculer la cohomologie et la K-théorie équivariantes des variétés de Bott-Samelson (théorèmes 3.3 et 4.3) et d’en déduire des résultats sur les variétés de drapeaux des groupes de Kac-Moody. Dans la section 3, on retrouve la formule de restriction aux points fixes de la base { ξ ^ w } w W de H T * ( G / B ) (théorème 3.9) prouvée par Sara Billey dans [4]. Dans la section 4, on donne l’expression explicite de la restriction aux points fixes de la base { ψ ^ w } w W de K T ( G / B ) définie par Kostant et Kumar dans...

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