Topological Tree Alternative Conjecture for locally finite trees

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Let TT be a locally finite tree, and write S≡♯TS\equiv^{\sharp}T when SS and TT are mutually topological minors, meaning S≤♯TS\leq^{\sharp}T and T≤♯ST\leq^{\sharp}S. Count the isomorphism classes of such trees SS.

Topological Tree Alternative Conjecture. For a given locally finite tree TT, the number of isomorphism classes of trees that are mutually topological minors with TT is either 11 or c\mathfrak c.

This is the topological-minor analogue of the Tree Alternative Conjecture. It gives a sharp alternative for the size of each mutual-topological-minor equivalence class, and the supplied text does not state that it has been resolved.

References

Primary source

Jorge Bruno and Paul J. Szeptycki, “Locally finite trees and the topological minor relation”, arXiv:1705.04937 (2017).

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