Maximal-minor truncation conjecture for Jacobian dual matrices

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Let S=k[x1,…,xn]S=k[x_1,\dots,x_n] be a polynomial ring, let I=(f1,…,fr)I=(f_1,\dots,f_r) be a linearly presented m⁡\operatorname{\mathfrak{m}}-primary ideal of SS, and let

Φ:Pn−1⇢Pr−1\Phi:\mathbb{P}^{n-1}\dashrightarrow\mathbb{P}^{r-1}

be the rational map defined by f1,…,frf_1,\dots,f_r. Let Θ\Theta be the Jacobian dual matrix of a presentation matrix of II, and write WW for the image of Φ\Phi. Maximal-minor truncation conjecture. One has

In(Θ)=I(W)≥n.I_n(\Theta)=I(W)_{\geq n}.

The preceding theorem in the supplied text identifies the saturation of In(Θ)I_n(\Theta) with I(W)I(W); this conjecture asserts the stronger equality with the degree-nn truncation. No resolution is supplied here.

References

Primary source

Marc Chardin and Navid Nemati, “Equations of some embeddings of a projective space into another one”, arXiv:2012.05681 (2020).

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