Spencer's Bus Stop Problem for integral stationary geodesic networks

Fix a Riemannian nn-manifold (M,g)(M,g), n2n \geq 2, and let UVMU \subset\subset V \subset\subset M be open. An integral stationary geodesic network is a geodesic network with integer multiplicities that is stationary for the length functional. Spencer's Bus Stop Problem. For any L0L \geq 0, there is a constant C=C(M,U,V,L)C=C(M,U,V,L) such that any integral stationary geodesic network XMX \subset M whose total length counted with multiplicity in VV is at most LL has at most CC singular points in UU. This would extend the Euclidean partial ϵ\epsilon-regularity result to arbitrary Riemannian manifolds and give a uniform local bound on singularities under a local mass bound; the source does not provide evidence that the conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Henry Bosch, “A Partial ε-Regularity Theorem for Integral Stationary Geodesic Networks in R^n”, arXiv:2607.23872 (2026).

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