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Local sections of Serre fibrations with 2-manifold fibers  [PDF]
N. Brodsky,A. Chigogidze,E. V. Shchepin
Mathematics , 2009,
Abstract: It was proved by H. Whitney in 1933 that a Serre fibration of compact metric spaces admits a global section provided every fiber is homeomorphic to the unit interval [0,1]. Results of this paper extend Whitney theorem to the case when all fibers are homeomorphic to a given compact two-dimensional manifold.
Sections of Serre fibrations with low-dimensional fibers  [PDF]
N. Brodsky,A. Chigogidze,E. V. Shchepin
Mathematics , 2002,
Abstract: It was proved by H. Whitney in 1933 that it is possible to mark a point in all curves in a continuous way. The main result of this paper extends the Whitney theorem to dimensions 2 and 3. Namely, we prove that it is possible to choose a point continuously in all two-dimensional surfaces sufficiently close to a given surface, and in all 3-manifolds sufficiently close to a given 3-manifold.
The Serre problem with Reinhardt fibers  [PDF]
Peter Pflug,W?odzimierz Zwonek
Mathematics , 2002,
Abstract: The Serre problem for a class of hyperbolic pseudoconvex Reinhardt domains in $\Bbb C^2$ as fibers is solved.
On the Topology of Fibrations with Section and Free Loop Spaces  [PDF]
Sadok Kallel,Denis Sjerve
Mathematics , 2000,
Abstract: We relate the brace products of a fibration with section to the differentials in its serre spectral sequence. In the particular case of free loop fibrations, we establish a link between these differentials and browder operations in the fiber. Applications and several calculations (for the particular case of spheres and wedges of spheres) are given.
Generic fibrations around multiple fibers  [PDF]
Kyle Larson
Mathematics , 2014,
Abstract: Given some type of fibration on a 4-manifold $X$ with a torus regular fiber $T$, we may produce a new 4-manifold $X_T$ by performing torus surgery on $T$. There is a natural way to extend the fibration to $X_T$, but a multiple fiber (non-generic) singularity is introduced. We construct explicit generic fibrations (with only indefinite fold singularities) in a neighborhood of this multiple fiber. As an application this gives explicit constructions of broken Lefschetz fibrations on all elliptic surfaces (e.g. the family $E(n)_{p,q}$). As part of the construction we produce generic fibrations around exceptional fibers of Seifert fibered spaces.
Fibrations with noncommutative fibers  [PDF]
Siegfried Echterhoff,Ryszard Nest,Herve Oyono-Oyono
Mathematics , 2008,
Abstract: We study an analogue of fibrations of topological spaces with the homotopy lifting property in the setting of C*-algebra bundles. We then derive an analogue of the Leray-Serre spectral sequence to compute the K-theory of the fibration in terms of the cohomology of the base and the K-theory of the fibres. We present many examples which show that fibrations with noncommutative fibres appear in abundance in nature.
On fibrations whose geometric fibers are nonreduced  [PDF]
Stefan Schroeer
Mathematics , 2009,
Abstract: We give a bound on embedding dimensions of geometric generic fibers in terms of the dimension of the base, for fibrations in positive characteristic. This generalizes the well-known fact that for fibrations over curves, the geometric generic fiber is reduced. We illustrate our results with Fermat hypersurfaces and genus one curves.
Fiber products of elliptic surfaces with section and associated Kummer fibrations  [PDF]
Grzegorz Kapustka,Michal Kapustka
Mathematics , 2008,
Abstract: We investigate Calabi--Yau three folds which are small resolutions of fiber products of elliptic surfaces with section admitting reduced fibers. We start by the classification of all fibers that can appear on such varieties. Then, we find formulas to compute the Hodge numbers of obtained three folds in terms of the types of singular fibers of the elliptic surfaces. Next we study Kummer fibrations associated to these fiber products.
Fibers of Cyclic Covering Fibrations of a Ruled Surface  [PDF]
Makoto Enokizono
Mathematics , 2015,
Abstract: We give an algorithm to classify singular fibers of finite cyclic covering fibrations of a ruled surface by using singularity diagrams. As a first application, we classify all fibers of 3-cyclic covering fibrations of genus 4 of a ruled surface and show that the signature of a complex surface with this fibration is non-positive by computing the local signature for any fiber. As a second application, we classify all fibers of hyperelliptic fibrations of genus 3 into 12 types according to the Horikawa index. We also prove that finite cyclic covering fibrations of a ruled surface have no multiple fibers if the degree of the covering is greater than 3.
Fibrations structure and degree formulae for Milnor fibers  [PDF]
Nicolas Dutertre,Raimundo N. Araújo Dos Santos,Ying Chen,Antonio Andrade
Mathematics , 2014,
Abstract: In this survey, we remind some fibrations structure theorems (also called Milnor's fibrations) recently proved in the real and complex case, in the local and global settings. We give several Poincar\'e-Hopf type formulae which relates the Euler-Poincar\'e characteristic of these fibers (also called Milnor's fibers) and indices (topological degree) of appropriated vector fields defined on spheres of radii small or big enough.
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