共查询到20条相似文献,搜索用时 15 毫秒
1.
M. Bakuradze M. Jibladze V. V. Vershinin 《Proceedings of the American Mathematical Society》2003,131(6):1935-1942
Decompositions of products of the Ray elements by free generators of small dimensions in the symplectic cobordism ring are obtained. In particular it is stated that most of the -dimensional generators, for small, after multiplication by the Ray elements , , land in the ideal generated by Ray elements of low dimension.
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Elisenda Feliu 《Journal of Pure and Applied Algebra》2011,215(6):1223-1242
We give an axiomatic characterization of maps from algebraic K-theory. The results apply to a large class of maps from algebraic K-theory to any suitable cohomology theory or to algebraic K-theory. In particular, we obtain comparison theorems for the Chern character and Chern classes and for the Adams operations and λ-operations on higher algebraic K-theory. We show that the Adams operations and λ-operations defined by Grayson agree with the ones defined by Gillet and Soulé. 相似文献
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Neeta Singh 《Proceedings of the American Mathematical Society》1996,124(8):2561-2569
We prove the existence and nontriviality of tertiary exotic characteristic classes extending the results of Peterson and Ravenel for secondary exotic classes.
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S. L. Lyakhovich E. A. Mosman A. A. Sharapov 《Functional Analysis and Its Applications》2008,42(1):75-77
Characteristic classes are defined for supermanifolds equipped with a homological vector field Q. We construct an infinite series of characteristic classes defined in terms of the second covariant derivatives of Q. 相似文献
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Let BG be the classifying space for stable spherical fibrations, and let V be a finite dimensional vector subspace of the cohomology algebra H1(BG; 2). We prove that V may be realized by a Poincaré duality space P, which means that if v:P→BG is the Spivak fibration, then v1 maps V isomorphically onto its image in H1(P;2). By construction, P is the product of a certain Grassman manifold and a spherical fiber space over a closed smooth manifold. 相似文献
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David Handel 《Topology》1976,15(2):155-157
9.
Artur Heil 《Topology and its Applications》1985,21(3):269-286
We define for every so-called admissible relation r in the Steenrod algebra and for every oriented spherical fibration ξ over a CW-space an exotic characteristic class (mod 2) ε(r)(ξ), which is primitive and vanishes for sphere bundles. The set of exotic classes associated with the universal spherical fibration and the admissible Adem relations are compared with the algebra generators of H1(BSG;2) due to Milgram. Moreover, their behaviour under the action of is computed. Finally, we give a secondary Wu formula for exotic classes of special Poincaré duality spaces. 相似文献
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D. M. Segal 《Commentarii Mathematici Helvetici》1970,45(1):159-169
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Maria Dedò 《Annali di Matematica Pura ed Applicata》1978,117(1):207-226
Sunto. Viene generalizzata al caso di varietà PL la nota costruzione dei cicli rappresentativi delle classi caratteristiche di una
varietà differenziabile come autointersezioni del fibrato tangente proiettificato. Tale generalizzazione che conduce a classi
caratteristiche valide sia in coomologia che in cobordismo, si basa su una costruzione geometrica dei quadrati di Steenrod.
Entrata in Redazione il 19 aprile 1977.
Research made when the author was a member of the G.N.S.A.G.A. of the C.N.R. 相似文献
Entrata in Redazione il 19 aprile 1977.
Research made when the author was a member of the G.N.S.A.G.A. of the C.N.R. 相似文献
13.
Wang Yanying 《Proceedings of the American Mathematical Society》2001,129(3):899-911
Some groups of -dimensional unoriented cobordism classes represented by the total space of a fibering with the real projective space as fiber are determined.
14.
Gerd Laures 《Transactions of the American Mathematical Society》2000,352(12):5667-5688
This work sets up a cobordism theory for manifolds with corners and gives an identification with the homotopy of a certain limit of Thom spectra. It thereby creates a geometrical interpretation of Adams-Novikov resolutions and lays the foundation for investigating the chromatic status of the elements so realized. As an application, Lie groups together with their left invariant framings are calculated by regarding them as corners of manifolds with interesting Chern numbers. The work also shows how elliptic cohomology can provide useful invariants for manifolds of codimension 2.
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Johannes Ebert 《Topology and its Applications》2008,156(2):246-250
In this note we introduce a construction which assigns to an arbitrary manifold bundle its fiberwise orientation covering. This is used to show that the zeta classes of non-oriented surface bundles are not divisible in the stable range. 相似文献
17.
《Topology and its Applications》2009,156(2):246-250
In this note we introduce a construction which assigns to an arbitrary manifold bundle its fiberwise orientation covering. This is used to show that the zeta classes of non-oriented surface bundles are not divisible in the stable range. 相似文献
18.
Let be a proper generic map between smooth manifolds with dimN−dimM=−1. We explicitly calculate the cohomology class dual to the closure of the set of points in N over which lies a specific singular fiber in terms of characteristic classes of M and N. 相似文献
19.
Camille Laurent-Gengoux 《Comptes Rendus Mathematique》2004,339(8):567-572
We construct secondary classes for super-foliations of codimension and . We indicate how to generalize this construction for any regular super-foliations on super-manifolds. We interpret the secondary classes as classes of foliated flat connections. To cite this article: C. Laurent-Gengoux, C. R. Acad. Sci. Paris, Ser. I 339 (2004). 相似文献
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