Coarse Whitehead conjecture for spaces with finitely many ends

Let XX and YY be compact metric spaces with finite shape dimension, let a:cXcY\mathfrak{a}:cX\to cY be a coarse map, and suppose that MXM_X has tNt\in\mathbb{N} ends. Choose [τ1],,[τt]π0c(cX)[\tau_1],\ldots,[\tau_t]\in\pi_0^c(cX) whose images under θ\theta represent these ends. Assume that, for every τ{τ1,,τt}\tau\in\{\tau_1,\ldots,\tau_t\} and every n0n\geq0, the induced map a:πnc(cX,τ)πnc(cY,aτ)\mathfrak{a}:\pi_n^c(cX,\tau)\to\pi_n^c(cY,\mathfrak{a}\tau) is an isomorphism. Finite-ended coarse Whitehead conjecture. There is an lNl\in\mathbb{N} such that ψ=(islaR)\psi=(is_l\mathfrak{a}R)^\sim induces an isomorphism

bψ:πne(MX,iτ~)πne(MY,islaτ~)b\circ\psi:\pi_n^e(M_X,\widetilde{i\tau})\to\pi_n^e(M_Y,\widetilde{is_l\mathfrak{a}\tau})

for all n0n\geq0 and all chosen τ\tau. If ψ\psi additionally induces an isomorphism on the ends of MXM_X and MYM_Y, then a\mathfrak{a} is a coarse homotopy equivalence. This is proposed as an extension of coarse Whitehead from connected spaces to spaces whose model has finitely many ends.

Sources & referencesView supporting material

Primary source

Felix Lange, “Coarse Homotopy Theory and Shape Theory”, arXiv:2606.14212 (2026).

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