The algebraic and symmetric shifting Betti-number conjecture

Let Δ\Delta be a simplicial complex over a field KK of characteristic zero. Let IΔsI_{\Delta^s} and IΔeI_{\Delta^e} denote the Stanley–Reisner ideals of the symmetric and exterior shifts of Δ\Delta, respectively, and let βi,j\beta_{i,j} denote graded Betti numbers.

Algebraic and symmetric shifting conjecture. For all i,ji,j,

βi,j(IΔs)βi,j(IΔe).\beta_{i,j}(I_{\Delta^s})\leq \beta_{i,j}(I_{\Delta^e}).

This conjecture compares the graded Betti numbers arising from symmetric and exterior algebraic shifting; the supplied source does not indicate whether it has been resolved.

Sources & referencesView supporting material

Primary source

Luis Pedro Montejano and Luis Núñez Betancourt, “b-vectors of chordal graphs”, arXiv:1709.00474 (2017).

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