arXiv2026
In this paper, we study minimal generators of the (saturated) defining ideal of the $k$-secant variety $σ_k(v_d(\mathbb{P}^n))$ of the image of the $d$-uple Veronese embedding $v_d: \mathbb{P}^n \rightarrow \mathbb{P}^N$ with ${N=\binom{n+d}{d}-1}$, focusing on cases where the degree of $σ_k(v_d(\mathbb{P}^n))$ is relatively small. First, we show that the prime ideal $I(σ_4(v_3(\mathbb{P}^3)))$ is minimally generated by $36$ homogeneous polynomials of degree $5$. This implies that $σ_4(v_3(\mathbb{P}^3)) \subset \mathbb{P}^{19}$ is a del Pezzo $4$-secant variety (i.e., $\mathrm{deg}(σ_4(v_3(\mathbb{P}^3))) = 105$ and the sectional genus $π(σ_4(v_3(\mathbb{P}^3))) = 316$), thereby providing a new example of an arithmetically Gorenstein variety of codimension $4$. This result addresses the symmetric version of the ``Salmon problem'' posed by E. Allman in \cite{Allman}. As an application, we decide the non-singularity of a certain locus in $σ_4(v_3(\mathbb{P}^3))$. Furthermore, by inheritance, we obtain the generators of $I(σ_4(v_3(\mathbb{P}^n)))$ for all $n \geq 3$. Based on the method used for $σ_4(v_3(\mathbb{P}^3))$, we also propose a procedure to compute the first non-trivial degree piece, $I(σ_k(v_d(\mathbb{P}^n)))_{k+1}$, for the general $k$-secant case using prolongation and weight space decomposition. Applying this procedure, we present a few more cases of $k$-secant varieties of relatively small degrees; in each of these cases, the ideal is generated in degree $k+1$ and can be fully determined by explicitly computing all generators within this degree piece.