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arXiv 0812.1197math.AGmath.AC
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经典判别式的一个新的行列式公式

A new determinantal formula for the classical discriminant

Bradford Hovinen

摘要:

根据Bezout,Sylvester,Cayley等人的几个经典结果,n次多项式的经典判别式D_n可以表示为矩阵的行列式,矩阵的元素在f的系数中是简单得多的多项式。然而,在经典文献中出现的所有关于D_n的行列式公式在其相关矩阵的上核同构为相关多项式环上的模的意义下是等价的。这就引出了一个问题:是否存在与经典公式不等价的公式,并且在与1 × 1矩阵(D_n)具有相同的上核的意义下不是平凡的。在本文中,我们构造了一个显式的非经典公式:首先由Arnol'd和Givental研究的开放燕尾的表示矩阵。我们研究了这个公式的性质,并与经典公式的性质进行了对比。

英文摘要:

According to several classical results by Bezout, Sylvester, Cayley, and others, the classical discriminant D_n of degree n polynomials may be expressed as the determinant of a matrix whose entries are much simpler polynomials in the coefficients of f. However, all of the determinantal formulae for D_n appearing in the classical literature are equivalent in the sense that the cokernels of their associated matrices are isomorphic as modules over the associated polynomial ring. This begs the question of whether there exist formulae which are not equivalent to the classical formulae and not trivial in the sense of having the same cokernel as the 1 x 1 matrix (D_n). In this paper, we construct an explicit non-classical formula: the presentation matrix of the open swallowtail first studied by Arnol'd and Givental. We study the properties of this formula, contrasting them with the properties of the classical formulae.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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