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Geometry of hyperfields

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arxiv 1707.09348 v3 pith:XF4PSR3W submitted 2017-07-28 math.AG

classification math.AG
keywords hyperfieldhomeomorphicspaceunderlyingwhenschemetopologyanalytificaiton
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abstract

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

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  1. On the borderline of fields and hyperfields, part II -- Enumeration and classification of the hyperfields of order 7

    math.RA 2024-12 conditional novelty 6.0 of 10

    There are exactly 277 seven-element hyperfields, all built on the cyclic multiplicative group of order six, and the paper classifies which of them arise as quotients of fields.

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