Finiteness equivalence for Thompson-type groups of a Cantor-algebra

Let Ur(Σ)U_r(\Sigma) be a Cantor-algebra, with associated groups Gl(Σ)G_l(\Sigma) for 1ld1\leq l\leq d. The notation FP\operatorname{FP}_\infty and F\operatorname{F}_\infty denotes the corresponding ordinary finiteness properties, while quasi-FP\underline{\operatorname{FP}}_\infty and quasi-F\underline{\operatorname{F}}_\infty denote their Bredon finiteness analogues.

Finiteness equivalence conjecture.

Gr(Σ) is quasi-FPGl(Σ) is of ordinary type FP for any 1ld,G_r(\Sigma)\text{ is quasi-}\underline{\operatorname{FP}}_\infty\Leftrightarrow G_l(\Sigma)\text{ is of ordinary type }\operatorname{FP}_\infty\text{ for any }1\leq l\leq d,

and

Gr(Σ) is quasi-FGl(Σ) is of ordinary type F for any 1ld.G_r(\Sigma)\text{ is quasi-}\underline{\operatorname{F}}_\infty\Leftrightarrow G_l(\Sigma)\text{ is of ordinary type }\operatorname{F}_\infty\text{ for any }1\leq l\leq d.

The surrounding text presents closely related equivalences as theorems for the groups Tr(Σ)T_r(\Sigma), but the supplied candidate is marked with unknown status and its notation differs from that theorem statement; its precise conjectural status and intended relation to the proved results should be checked against the source.

Sources & referencesView supporting material

Primary source

Conchita Martinez-Perez and Brita E. A. Nucinkis, “Bredon cohomological finiteness conditions for generalisations of Thompson's groups”, arXiv:1105.0189 (2013).

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