English

Geometry of hyperfields

Algebraic Geometry 2020-11-03 v3

Abstract

Given a scheme XX over Z\mathbb{Z} and a hyperfield HH which is equipped with topology, we endow the set X(H)X(H) of HH-rational points with a natural topology. We then prove that; (1) when HH is the Krasner hyperfield, X(H)X(H) is homeomorphic to the underlying space of XX, (2) when HH is the tropical hyperfield and XX is of finite type over a complete non-Archimedean valued field kk, X(H)X(H) is homeomorphic to the underlying space of the Berkovich analytificaiton XanX^{\textrm{an}} of XX, and (3) when HH is the hyperfield of signs, X(H)X(H) is homeomorphic to the underlying space of the real scheme XrX_r associated with XX.

Keywords

Cite

@article{arxiv.1707.09348,
  title  = {Geometry of hyperfields},
  author = {Jaiung Jun},
  journal= {arXiv preprint arXiv:1707.09348},
  year   = {2020}
}

Comments

26 pages, Final version to appear in Journal of algebra

R2 v1 2026-06-22T21:00:33.153Z