Burnham–Rosen–Sidman–Vermeire conjecture on graph curves and Betti tables

Let GG be a graph with dd vertices, genus gg, and girth b3b3. Let G\overline{G} be the corresponding graph curve, with Betti numbers bi,j(G)b_{i,j}(\overline{G}). Burnham–Rosen–Sidman–Vermeire conjecture. If d=2g+1+pd=2g+1+p and γ2p\gamma-2\leq p, then

bγ2,γ(G)b_{\gamma-2,\gamma}(\overline{G})

is equal to the number of γ\gamma-cycles in GG. This predicts that a graph's cycle structure is reflected in the Betti table of its graph curve; the paper proves a specific case for trees of cycles, while the stated general form is not resolved here.

Sources & referencesView supporting material

Primary source

David J. Bruce, Pin-Hung Kao, Evan D. Nash, Ben Perez and Peter Vermeire, “Betti Tables of Reducible Algebraic Curves”, arXiv:1210.3064 (2012).

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