Maximum Diversity and Support Transitions on Disks and Three-Dimensional Balls

Abstract

For the similarity kernel e^−|x−y|, we determine the probability measure of maximum diversity on every planar disk and three-dimensional ball, answering a question of Leinster and Roff. In each dimension the measure is uniform on the boundary up to a threshold. Above it, the support is a closed central ball and the outer sphere, separated by a mass-free annulus. In dimensions two and three, their conjecture of finitely many supporting spheres therefore holds only up to the respective threshold. We obtain the measure explicitly up to one scalar root in three dimensions and through Fredholm integral equations and a scalar contact equation in the plane. Computations in dimensions four and five suggest that interior supporting spheres appear one at a time.

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BibTeX RIS

BibTeX

@misc{dajani2026maximum,
  title = {{Maximum Diversity and Support Transitions on Disks and Three-Dimensional Balls}},
  author = {Adam Dajani},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.38031},
  eprint = {2610.38031},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.38031},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Maximum Diversity and Support Transitions on Disks and Three-Dimensional Balls
AU  - Adam Dajani
PY  - 2026
DA  - 2026/10/27
PB  - arXiv
DO  - 10.48550/arxiv.2610.38031
UR  - https://arxiv.org/abs/2610.38031
AB  - For the similarity kernel e^−|x−y|, we determine the probability measure of maximum diversity on every planar disk and three-dimensional ball, answering a question of Leinster and Roff. In each dimension the measure is uniform on the boundary up to a threshold. Above it, the support is a closed central ball and the outer sphere, separated by a mass-free annulus. In dimensions two and three, their conjecture of finitely many supporting spheres therefore holds only up to the respective threshold. We obtain the measure explicitly up to one scalar root in three dimensions and through Fredholm integral equations and a scalar contact equation in the plane. Computations in dimensions four and five suggest that interior supporting spheres appear one at a time.
ER  -

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