Herzog's minimality conjecture for exterior generic annihilator numbers

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Let EE be the exterior algebra on E1E_1, let J⊆EJ\subseteq E be a graded ideal, and let v1,…,vnv_1,\ldots,v_n be a basis of E1E_1. Write αi,j(E/J)\alpha_{i,j}(E/J) for the exterior generic annihilator numbers of E/JE/J, and αi,j(v1,…,vn;E/J)\alpha_{i,j}(v_1,\ldots,v_n;E/J) for the exterior annihilator numbers with respect to this basis.

Herzog's minimality conjecture. For 1≤i≤n1\leq i\leq n and j≥0j\geq 0,

αi,j(E/J)≤αi,j(v1,…,vn;E/J).\alpha_{i,j}(E/J)\leq \alpha_{i,j}(v_1,\ldots,v_n;E/J).

The conjecture asks whether the exterior generic annihilator numbers are minimal among the exterior annihilator numbers associated to all bases. The surrounding discussion states that the conjecture is false and provides a counterexample; corresponding symmetric generic annihilator numbers are also shown to admit a counterexample after slight modifications.

References

Primary source

Gesa Kaempf and Martina Kubitzke, “Exterior depth and exterior generic annihilator numbers”, arXiv:0903.3884 (2009).

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