منابع مشابه
Infinitesimal Deformations of Double Covers of Smooth Algebraic Varieties
The goal of this paper is to give a method to compute the space of infinitesimal deformations of a double cover of a smooth algebraic variety. This research was inspired by the analysis of Calabi–Yau manifolds that arise as smooth models of double covers of P branched along singular octic surfaces ([4, 3]). It is of considerable interest to determine the Hodge numbers for these manifolds, but t...
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We give a pure algebraic method to construct all the infinite families of surfaces S with isotrivial canonical fibration where S is the minimal desingularization of X = Z/G and G is an Abelian group acting diagonally on the product of two smooth curves: Z = F ×D. In particular we recover all the known infinite families of surfaces with isotrivial canonical fibration and we produce many new ones...
متن کاملDeformations of Covers, Brill-noether Theory, and Wild Ramification
In this paper, we give a simple description of the deformations of a map between two smooth curves with partially prescribed branching, in the cases that both curves are fixed, and that the source is allowed to vary. Both descriptions work equally well in the tame or wild case. We then apply this result to obtain a positive-characteristic Brill-Noether-type result for ramified maps from general...
متن کاملFlows, flow-pair covers and cycle double covers
In this paper, some earlier results by Fleischner [H. Fleischner, Bipartizing matchings and Sabidussi’s compatibility conjecture, DiscreteMath. 244 (2002) 77–82] about edge-disjoint bipartizingmatchings of a cubic graphwith a dominating circuit are generalized for graphs without the assumption of the existence of a dominating circuit and 3-regularity. A pair of integer flows (D, f1) and (D, f2)...
متن کاملSuborthogonal double covers of complete graphs
A family G of isomorphic copies of a given graph G is said to be a suborthogonal double cover (SODC) of the complete graph K n by G, if every edge of K n belongs to exactly two members of G and any two diierent elements from G share at most one edge. We introduce the notion of an SODC as a generalization of the well-known concept of orthogonal double covers. Our objective is to investigate the ...
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ژورنال
عنوان ژورنال: Journal of Algebra
سال: 2016
ISSN: 0021-8693
DOI: 10.1016/j.jalgebra.2016.06.009