The lattice formulation of Stanley's conjecture

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Let LL be a finite semilattice. Choose an ideal I⊂S=K[X1,…,Xn]I\subset S={\mathbb K}[X_1,\dotsc,X_n] such that LI≅LL_I\cong L, and define

pdim⁡1L:=pdim⁡I,pdim⁡2L:=pdim⁡S/I,\operatorname{pdim}_1 L:=\operatorname{pdim} I,\qquad \operatorname{pdim}_2 L:=\operatorname{pdim} S/I, spdim⁡1L:=spdim⁡I,spdim⁡2L:=spdim⁡S/I.\operatorname{spdim}_1 L:=\operatorname{spdim} I,\qquad \operatorname{spdim}_2 L:=\operatorname{spdim} S/I.

Lattice formulation of Stanley's conjecture. For all finite semilattices LL, the following inequalities hold:

spdim⁡1L≤pdim⁡1L,\operatorname{spdim}_1 L\leq\operatorname{pdim}_1 L, spdim⁡2L≤pdim⁡2L,\operatorname{spdim}_2 L\leq\operatorname{pdim}_2 L, spdim⁡1L≤spdim⁡2L−1.\operatorname{spdim}_1 L\leq\operatorname{spdim}_2 L-1.

This reformulates the Stanley conjecture for ideals and quotients, together with the conjectured inequality relating their Stanley depths, as a statement about finite semilattices. The source gives no resolution status, so the formulation remains open here.

References

Primary source

Bogdan Ichim, Lukas Katthän and Julio José Moyano-Fernández, “Stanley depth and the lcm-lattice”, arXiv:1405.3602 (2017).

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