Two special cases of the minimum distance conjecture for complete intersections

Let X\mathbb{X} be a finite set of reduced points in Ps1\mathbb{P}^{s-1}, and suppose that I=I(X)I=I(\mathbb{X}) is a complete intersection generated by f1,,fcf_1,\ldots,f_c, where c=s1c=s-1, di=deg(fi)d_i=\deg(f_i) for i=1,,ci=1,\ldots,c, and 2didi+12\leq d_i\leq d_{i+1} for all ii. Two special cases of the minimum distance conjecture. (a) One has

δI(1)(d11)d2dc.\delta_I(1)\geq (d_1-1)d_2\cdots d_c.

(b) If f1,,fcf_1,\ldots,f_c are quadratic forms, then

δI(d)2cdfor 1dc,\delta_I(d)\geq 2^{c-d}\qquad\text{for }1\leq d\leq c,

or, equivalently,

hypI(d)2c2cdfor 1dc.\operatorname{hyp}_I(d)\leq 2^c-2^{c-d}\qquad\text{for }1\leq d\leq c.

These are explicitly identified as two special cases that remain open. The first is attributed to Tohăneanu and Vântuyl; the second concerns complete intersections generated by quadrics.

Sources & referencesView supporting material

Primary source

Susan M. Cooper, Alexandra Seceleanu, Stefan O. Tohaneanu, Maria Vaz Pinto and Rafael H. Villarreal, “Generalized minimum distance functions and algebraic invariants of Geramita ideals”, arXiv:1812.06529 (2019).

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