Extension of Theorem 1 to arbitrary spherically complete sets

Let AA and BB be nonempty spherically complete subsets of an ultrametric space, and let Statements (i)--(iv) denote the four statements from Theorem 1. Extension conjecture. Statements (i)--(iv) remain valid for all such sets AA and BB, even when

δ(B)dist(A,B)\delta(B)\leq \operatorname{dist}(A,B)

does not hold.

The claim proposes removing the inequality hypothesis from Theorem 1 while retaining all four conclusions. The supplied text does not indicate whether this extension has been proved or disproved.

Sources & referencesView supporting material

Primary source

K. Chaira, O. Dovgoshey and S. Lazaiz, “Best proximity pairs in ultrametric spaces”, arXiv:2109.05728 (2021).

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