Borel almost finiteness conjecture for uniformly Borel amenable Følner graphs
Borel almost finiteness conjecture for uniformly Borel amenable Følner graphs
Let be a bounded-degree Borel graph. Call a uniformly Borel amenable Følner graph when it has the uniform Borel amenability and Følner properties defined in the source. Call Borel almost finite if, for every , there is such that admits an -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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