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Notes on valuation theory for Krasner hyperfields

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arxiv 2301.08639 v1 pith:HVSYLYIS submitted 2023-01-20 math.AC

classification math.AC
keywords valuationhyperfieldskrasnertheoryadditivestructurevaluedanalogy
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abstract

The main aim of this article is to study and develop valuation theory for Krasner hyperfields. In analogy with classical valuation theory for fields, we generalise the formalism of valuation rings to describe equivalence of valuations on hyperfields. After proving basic results and discussing several examples, we focus on the valued hyperfields that Krasner originally defined in 1957. We find that these must have a particular additive structure which in turns implies the existence of a valuation a'la Krasner. We note that given such a valued hyperfield $(F,v)$, the valuation induced by its additive structure does not have to be equivalent to $v$. We discuss the cases in which it does.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Valued Mosaics

    math.CT 2026-08 conditional novelty 7.0 of 10

    Valuations are made primary in the theory of commutative mosaics, yielding a category with finite limits and coproducts, and factor nesting characterizes associativity among total product-ultrametric mosaics.

  2. 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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