Borel almost finiteness conjecture for uniformly Borel amenable Følner graphs

Let GG be a bounded-degree Borel graph. Call GG a uniformly Borel amenable Følner graph when it has the uniform Borel amenability and Følner properties defined in the source. Call GG Borel almost finite if, for every ε>0\varepsilon>0, there is k>0k>0 such that GG admits an (ε,k)(\varepsilon,k)-Følner tiling.

Borel Almost Finiteness Conjecture. Every uniformly Borel amenable Følner graph is Borel almost finite.

This conjecture is a guiding principle for uniformly Borel amenable Følner graphs and was originally proposed by Marks for free amenable actions. Its converse is false: there are Borel almost finite graphs that are not Borel amenable.

Sources & referencesView supporting material

Primary source

Gábor Elek and Ádám Timár, “Uniform Borel Amenability”, arXiv:2408.12565 (2026).

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