2015/11/25 by Letao Zhang, Zhang, Letao, Zhiyu Tian +1
Mathematics · #Advanced Harmonic Analysis Research #Algebraic Geometry (math.AG) #Algebraic Geometry and Number Theory #FOS: Mathematics #Number Theory (math.NT) #Tensor decomposition and applications
paper · pdf · doi:10.48550/arxiv.1511.08156
openalex publication_date 2015/11/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In this article we prove the following theorems about weak approximation of smooth cubic hypersurfaces and del Pezzo surfaces of degree 4 defined over global fields. (1) For cubic hypersurfaces defined over global function fields, if there is a rational point, then weak approximation holds at places of good reduction whose residual field has at least 11 elements. (2) For del Pezzo surfaces of degree 4 defined over global function fields, if there is a rational point, then weak approximation holds at places of good reduction whose residual field has at least 13 elements. (3) Weak approximation holds for cubic hypersurfaces of dimension at least 10 defined over a global function field of characteristic not equal to 2, 3, 5 or a purely imaginary number field.