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Displaying 201 – 220 of 346

On Sp(2) and Sp(2) · Sp(1) structures in 8-dimensional vector bundles.

Martin Cadek, Jirí Vanzura (1997)

Publicacions Matemàtiques

Let ξ be an oriented 8-dimensional vector bundle. We prove that the structure group SO(8) of ξ can be reduced to Sp(2) or Sp(2) · Sp(1) if and only if the vector bundle associated to ξ via a certain outer automorphism of the group Spin(8) has 3 linearly independent sections or contains a 3-dimensional subbundle. Necessary and sufficient conditions for the existence of an Sp(2)- structure in ξ over a closed connected spin manifold of dimension 8 are also given in terms of characteristic classes.

On Stable Parallelizability of Gk,n and Related Manifolds.

I. Dotti Miatello, R.J. Miatello (1982)

Mathematische Annalen

On the Buchstaber subring in $M S p_{*}$ .

Bakuradze, M. (1998)

Georgian Mathematical Journal

On the Chern character of glued bundles

Jan A. Rempała (1988)

Annales Polonici Mathematici

On the De Rham Invariant of a Fibered (4r + l)-Dimensional Orientable Manifold.

J.C. Alexander (1981)

Mathematische Annalen

On the Density of Ratios of Chern Numbers of Algebraic Surfaces.

Andrew John Sommese (1984)

Mathematische Annalen

On the Euler Characteristic of Finite Unions of Convex Sets.

Beifang Chen (1993)

Discrete & computational geometry

On the Euler characteristic of multiple selfintersection points of immersed manifolds.

Akhmet'ev, P.M., Malešič, Jože, Repovš, Dušan (2003)

Sibirskij Matematicheskij Zhurnal

On the form of principal torus-bundles over toruses

T. Jakubowski (1974)

Colloquium Mathematicae

On the Geography of Surfaces. Simply Connected Minimal Surfaces with Positive Index.

Zhijie Chen (1987)

Mathematische Annalen

On the Godbillon-Vey invariant and global holonomy of $ℝ P^{1}$ -foliations.

Chihi, Slaheddine, ben Ramdane, Souad (2008)

Balkan Journal of Geometry and its Applications (BJGA)

On the Horizontal Base Locus of Multiples of Tautological Sheaves of Projectived Cotangent Bundles, II.

Tie Luo (1993)

Manuscripta mathematica

On the Jumping conics of a semistable rank two vector bundle on P2.

Mirella Manaresi (1990)

Manuscripta mathematica

On the non-invariance of span and immersion co-dimension for manifolds

Diarmuid J. Crowley, Peter D. Zvengrowski (2008)

Archivum Mathematicum

In this note we give examples in every dimension $m \geq 9$ of piecewise linearly homeomorphic, closed, connected, smooth $m$ -manifolds which admit two smoothness structures with differing spans, stable spans, and immersion co-dimensions. In dimension $15$ the examples include the total spaces of certain $7$ -sphere bundles over $S^{8}$ . The construction of such manifolds is based on the topological variance of the second Pontrjagin class: a fact which goes back to Milnor and which was used by Roitberg to give examples...

Let E → W be an oriented vector bundle, and let X(E) denote the Euler number of E. The paper shows how to calculate X(E) in terms of equations which describe E and W.

On vector bundles whose general sections have all projectively equivalent zero-loci

E. Ballico (1993)

Rendiconti del Seminario Matematico della Università di Padova

Currently displaying 201 – 220 of 346

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Displaying 201 – 220 of 346

On Sp(2) and Sp(2) · Sp(1) structures in 8-dimensional vector bundles.

On Stable Parallelizability of Gk,n and Related Manifolds.

On the Buchstaber subring in $M S p_{*}$ .

On the Chern character of glued bundles

On the De Rham Invariant of a Fibered (4r + l)-Dimensional Orientable Manifold.

On the Density of Ratios of Chern Numbers of Algebraic Surfaces.

On the Euler Characteristic of Finite Unions of Convex Sets.

On the Euler characteristic of multiple selfintersection points of immersed manifolds.

On the form of principal torus-bundles over toruses

On the Geography of Surfaces. Simply Connected Minimal Surfaces with Positive Index.

On the Godbillon-Vey invariant and global holonomy of $ℝ P^{1}$ -foliations.

On the Horizontal Base Locus of Multiples of Tautological Sheaves of Projectived Cotangent Bundles, II.

On the Jumping conics of a semistable rank two vector bundle on P2.

On the non-invariance of span and immersion co-dimension for manifolds

On the signatur of four-manifolds with universal covering spin.

On the Stiefel-Whitney classes and the span of real Grassmannians

On the structure of 5-dimensional Poincaré duality spaces.

On the topology of double coset manifolds.

On topological invariants of vector bundles

On vector bundles whose general sections have all projectively equivalent zero-loci

Currently displaying 201 – 220 of 346