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arXiv math/0601705math.AGmath.AC
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关于二元判别式的雅可比理想

On the Jacobian ideal of the binary discriminant

Carlos D'Andrea, Jaydeep Chipalkatti, Abdelmalek Abdesselam

摘要:

令$Δ$表示通用二进制$d$ -ic的判别式。证明了对于$d \ge 3$,$Δ$的雅可比理想是高度为2的理想.此外,我们还描述了它的SL_2-等变最小分解,以及$Δ$所满足的相关不变微分方程。对于两种形式的$d,e$阶的结式,只要$d \ge e-1$ .我们还解释了莫雷形式在结式的行列式公式中的作用;这依赖于附录中A.阿布德萨拉姆

英文摘要:

Let $Δ$ denote the discriminant of a generic binary $d$-ic. We show that for $d \ge 3$, the Jacobian ideal of $Δ$ is perfect of height 2. Moreover, we describe its SL_2-equivariant minimal resolution, and the associated invariant differential equations satisfied by $Δ$. A similar result is proved for the resultant of two forms of orders $d,e$, whenever $d \ge e-1$. We also explain the role of the Morley form in the determinantal formula for the resultant; this relies upon a calculation which is done in the appendix by A. Abdesselam.

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