The multi-intersection problem for three or more sets

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Let (M,ω)(M,\omega) be a closed symplectic manifold, let N≥3N\geq 3, and let D1,…,DND_1,\ldots,D_N be closed subsets of MM. The multi-intersection problem asks whether there exist Hamiltonian diffeomorphisms φ1,…,φN\varphi_1,\ldots,\varphi_N such that

⋂iφi(Di)=∅.\bigcap_i\varphi_i(D_i)=\varnothing.

Multi-intersection conjecture. Question has an affirmative answer provided there exist elements φi\varphi_i lying in the identity component of the group of volume-preserving diffeomorphisms and satisfying the displayed empty-intersection condition. For N≥3N\geq 3, the paper describes the multi-intersection problem as likely soft, in contrast with the case N=2N=2; the supplied text does not establish the asserted existence of such volume-preserving diffeomorphisms.

References

Primary source

Adi Dickstein, Yaniv Ganor, Leonid Polterovich and Frol Zapolsky, “Symplectic topology and ideal-valued measures”, arXiv:2107.10012 (2024).

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