Geramita's catalecticant ideal equality and inclusion conjecture

Let KK be a field, let n,d,keZn,d,ke\mathbb{Z} with k,n2k,n\geq 2 and d2k2d\geq 2k-2, and let Cat(t,dt;n)Cat(t,d-t;n) denote the tt-th generic catalecticant. Write Ik(Cat(t,dt;n))I_k(Cat(t,d-t;n)) for the ideal generated by its k×kk\times k minors. Geramita's conjecture. For every tt with k1tdk+1k-1\leq t\leq d-k+1, one has

Ik(Cat(k1,dk+1;n))=Ik(Cat(t,dt;n)).I_k(Cat(k-1,d-k+1;n))=I_k(Cat(t,d-t;n)).

Moreover,

Ik(Cat(1,d1;n))Ik(Cat(2,d2;n))Ik(Cat(k1,dk+1;n)).I_k(Cat(1,d-1;n))\subset I_k(Cat(2,d-2;n))\subset\cdots\subset I_k(Cat(k-1,d-k+1;n)).

This conjecture generalizes the questions about equality and inclusion of ideals of minors of catalecticants. The paper proves the corresponding case k=3k=3, but the general assertion is presented as open.

Sources & referencesView supporting material

Primary source

Claudiu Raicu, “3x3 Minors of Catalecticants”, arXiv:1011.1564 (2013).

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