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Computing Néron–Severi groups and cycle class groups

Published online by Cambridge University Press:  04 February 2015

Bjorn Poonen
Affiliation:
Department of Mathematics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA email poonen@math.mit.edu
Damiano Testa
Affiliation:
Mathematics Institute, University of Warwick, Coventry CV4 7AL, UK email adomani@gmail.com
Ronald van Luijk
Affiliation:
Mathematisch Instituut, Universiteit Leiden, Postbus 9512, 2300 RA, Leiden, The Netherlands email rvl@math.leidenuniv.nl
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Abstract

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Assuming the Tate conjecture and the computability of étale cohomology with finite coefficients, we give an algorithm that computes the Néron–Severi group of any smooth projective geometrically integral variety, and also the rank of the group of numerical equivalence classes of codimension $p$ cycles for any $p$.

Information

Type
Research Article
Copyright
© The Author(s) 2015