Finiteness conjecture for simple connected ordered matroids with prescribed broken-circuit topology

Let d,kd,k be positive integers. For an ordered matroid MM, write BC<(M)\overline{BC_<(M)} for its reduced broken circuit complex, and let hd1(BC<(M))h_{d-1}(\overline{BC_<(M)}) denote its (d1)(d-1)-st hh-number. Finiteness conjecture. The number of isomorphism classes of simple connected, rank dd ordered matroids MM satisfying

hd1(BC<(M))=kh_{d-1}(\overline{BC_<(M)})=k

is finite. This is a finiteness assertion for ordered matroids whose reduced broken circuit complexes have prescribed topology; the supplied text does not indicate whether it has been proved or disproved.

Sources & referencesView supporting material

Primary source

Federico Castillo and Jose Alejandro Samper, “Finiteness theorems for matroid complexes with prescribed topology”, arXiv:1809.00281 (2020).

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