منابع مشابه
Specialization of Zero Cycles
Let X be a proper scheme over a field K. There are two ways of organizing the points of X into equivalence classes using rational curves. One is the notion of R-equivalence introduced by [Manin72]. Two points x1, x2 ∈ X(K) are called directly R-equivalent if there is a morphism p : P → X with p(0:1) = x1 and p(1:0) = x2. This generates an equivalence relation called R-equivalence. The set of R-...
متن کاملZPC Matrices and Zero Cycles
Let H be an m × n real matrix and let Zi be the set of column indices of the zero entries of row i of H. Then the conditions |Zk ∩ ∪k−1 i 1 Zi | ≤ 1 for all k 2 ≤ k ≤ m are called the row Zero Position Conditions ZPCs . If H satisfies the ZPC, then H is said to be a row ZPC matrix. If H satisfies the ZPC, thenH is said to be a column ZPCmatrix. The real matrixH is said to have a zero cycle if H...
متن کاملNatural enemy specialization and the period of population cycles
P. Rohani*, H. J. Wearing, T. Cameron and S. M. Sait Institute of Ecology, University of Georgia, Athens, GA 30602, USA Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK Centre for Biodiversity & Conservation, School of Biology, University of Leeds, Leeds LS2 9JT, UK *Correspondence: E-mail: [email protected] Abstract The dynamical consequences of multiple-speci...
متن کاملResidues and Zero-Cycles on Algebraic Varieties
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متن کاملNorm functors and effective zero cycles
We compare two known definitions for a relative family of effective zero cycles, based on traces and norms of functions, respectively. In characteristic zero we show that both definitions agree. In the general setting, we show that the norm map on functions can be expanded to a norm functor between certain categories of line bundles, therefore giving a third approach to families of zero cycles.
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ژورنال
عنوان ژورنال: Publications of the Research Institute for Mathematical Sciences
سال: 2004
ISSN: 0034-5318
DOI: 10.2977/prims/1145475489