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On ultrametric-preserving functions

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arxiv 1902.08747 v2 pith:3MCDAWCV submitted 2019-02-23 math.MG

classification math.MG
keywords functionsfoundultrametricultrametric-preservingcharacterizationcharacterizationscharacterizecomposition
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abstract

Characterizations of pseudoultrametric-preserving functions and semimetric-preserving functions are found. The structural properties of pseudoultrametrics which can be represented as a composition of an ultrametric and ultrametric-pseudoultrametric-preserving function are found. A dual form of Pongsriiam-Termwuttipong characterization of the ultrametric-preserving functions is described. We also introduce a concept of $k$-separating family of functions and use it to characterize the ultrametric spaces.

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Cited by 1 Pith paper

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

  1. Combinatorial properties of ultrametrics and generalized ultrametrics

    math.MG 2019-08 accept novelty 6.0 of 10

    A pairwise mapping is combinatorially similar to an ultrametric exactly when its fibers are coherent, its derived value order is antisymmetric, all triangles are isosceles, and its value set can be embedded like a sub...

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