Coarse Whitehead conjecture for spaces with finitely many ends

Less than 1 year old · traced to

Let XX and YY be compact metric spaces with finite shape dimension, let a:cX→cY\mathfrak{a}:cX\to cY be a coarse map, and suppose that MXM_X has t∈Nt\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 n≥0n\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 l∈Nl\in\mathbb{N} such that ψ=(islaR)∼\psi=(is_l\mathfrak{a}R)^\sim induces an isomorphism

b∘ψ: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 n≥0n\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.

References

Primary source

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

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.