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arXiv 0910.5757math.AG
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对称多项式的判别式

Discriminants of Symmetric Polynomials

N. Perminov, Sh. Shakirov

摘要:

一个齐次多项式S(x_1,...,x_n)具有判别式D_{n|r}(S),当且仅当方程组dS/dx_i = 0有非平凡解.本文给出了对称(在x_1,...,x_n)n >= r个变量的r次齐次多项式。这个公式是免费的除法,从计算的角度来看是非常有效的:即使对于n ~ 20,借助这个公式的符号计算机计算也需要几秒钟。我们详细地计算了r = 2,3,4的情况,这在实际应用中可能是重要的.我们还考虑了完全反对称多项式的情况。

英文摘要:

A homogeneous polynomial S(x_1, ..., x_n) of degree r in n variables posesses a discriminant D_{n|r}(S), which vanishes if and only if the system of equations dS/dx_i = 0 has non-trivial solutions. We give an explicit formula for discriminants of symmetric (under permutations of x_1, ..., x_n) homogeneous polynomials of degree r in n >= r variables. This formula is division free and quite effective from the computational point of view: symbolic computer calculations with the help of this formula take seconds even for n ~ 20. We work out in detail the cases r = 2,3,4 which will be probably important in applications. We also consider the case of completely antisymmetric polynomials.

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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