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math.AP2026
From Whole-Space Theory to Boundary Value Problems for Mixed-Order PDEs
Guillaume Neuttiens, Jonas Sauer
We develop a general principle for passing from the analysis of partial differential operators on the whole space to boundary value problems on the half-space. The reduction separa…
cs.SI2026
T-REX: Fast and Dynamic Journey Planning for Continental-Scale Public Transit Networks
Jonas Sauer, Patrick Steil, Sascha Witt
We present T-REX (Transfer-Ranked EXploration), a new algorithm for journey planning in public transit networks on the country and continental scale. Our algorithm applies the prin…
cs.CG2026
Graph-Based Nearest-Neighbor Search without the Spread
Jeff Giliberti, Sariel Har-Peled, Jonas Sauer +1
Recent work showed how to construct nearest-neighbor graphs of linear size, on a given set of points in , such that one can answer ap…