Bagchi–Datta generalized lower bound conjecture for triangulated manifolds

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Let Δ\Delta be a connected triangulated (d−1)(d-1)-manifold without boundary, and let hr(Δ)h_r(\Delta) denote its hh-numbers and βj−1(Δ)\beta_{j-1}(\Delta) its Betti numbers. Bagchi–Datta's generalized lower bound conjecture for triangulated manifolds.

(i) For r=1,2,…,⌊d2⌋r=1,2,\ldots,\left\lfloor\frac d2\right\rfloor,

hr(Δ)≥hr−1(Δ)+(d+1r)∑j=1r(−1)r−jβj−1(Δ).h_r(\Delta)\geq h_{r-1}(\Delta)+\binom{d+1}{r}\sum_{j=1}^r(-1)^{r-j}\beta_{j-1}(\Delta).

(ii) If equality holds for some r<d2r<\frac d2 in (i), then Δ\Delta is locally (r−1)(r-1)-stacked. This conjecture extends the generalized lower bound conjecture from polytopal spheres to triangulated manifolds; the source does not state a resolution.

References

Primary source

Satoshi Murai and Eran Nevo, “On r-stacked triangulated manifolds”, arXiv:1209.0868 (2012).

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