Existence of a nice embedded tree

Let XX be a noncompact, metrizable generalized continuum. An infinite rooted tree is an infinite tree with a distinguished root, and a proper embedding is a topological embedding whose inverse images of compact sets are compact. The induced map on end spaces is denoted E(τ):E(T)E(X)E(\tau):E(T)\to E(X). Existence of a nice embedded tree conjecture. There exists an infinite rooted tree TT and a proper topological embedding

τ:TX\tau:T\rightarrowtail X

such that

E(τ):E(T)E(X)E(\tau):E(T)\to E(X)

is a homeomorphism. Moreover, TT may be chosen either to contain no leaves or so that the root is the unique leaf. This would provide a tree model for the end space of every noncompact metrizable generalized continuum, with additional control over the tree's leaves; the source presents it as a future direction and gives no known resolution.

Sources & referencesView supporting material

Primary source

William G. Bass and Jack S. Calcut, “Ends and end cohomology”, arXiv:2412.01816 (2025).

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