Le Donne's BLD embedding conjecture for compact length metric spaces

Let (X,dX)(\mathsf{X},\mathsf{d}_{\mathsf{X}}) be a compact length metric space with finite Hausdorff dimension. A bounded-length-distortion map, or BLD map, is a continuous map into a metric space whose lengths satisfy

1cLenX(γ)LenY(φγ)cLenX(γ)\frac{1}{c}\operatorname{Len}_{\mathsf{X}}(\gamma)\leq\operatorname{Len}_{\mathsf{Y}}(\varphi\circ\gamma)\leq c\operatorname{Len}_{\mathsf{X}}(\gamma)

for some c(0,+)c\in(0,+\infty) and every curve γ\gamma in X\mathsf{X}. Le Donne's BLD embedding conjecture. Every such X\mathsf{X} admits a BLD map into a Euclidean space that is also a topological embedding. The conjecture would generalize the known positive result for compact smooth manifolds equipped with sub-Finsler metrics, which are biLipschitz equivalent to sub-Riemannian metrics; its status is not resolved in the supplied source.

Sources & referencesView supporting material

Primary source

Roman D. Oleinik, “On one relaxation of the bounded-length-distortion condition in the context of metric measure spaces”, arXiv:2607.00278 (2026).

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