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arXiv math/9904120math.PR
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多齐次多项式方程组实根的期望个数

The Expected Number of Real Roots of a Multihomogeneous System of Polynomial Equations

Andrew McLennan

摘要:

定理1是将随机多齐次多项式方程组的平均实根数表示为随机矩阵行列式的平均绝对值的倍数的公式。定理2导出了特殊情况下均值的封闭形式表达式,包括Shub和Smale(对于一般齐次系统)和Rojas(对于“非混合”多齐次系统)的早期结果。定理3给出了根的平均数的上界和下界,其中下界是由伯恩斯坦定理确定的复根的一般数的平方根。这些界限是通过定理4中给出的递归不等式归纳得出的。

英文摘要:

Theorem 1 is a formula expressing the mean number of real roots of a random multihomogeneous system of polynomial equations as a multiple of the mean absolute value of the determinant of a random matrix. Theorem 2 derives closed form expressions for the mean in special cases that include earlier results of Shub and Smale (for the general homogeneous system) and Rojas (for ``unmixed'' multihomogeneous systems). Theorem 3 gives upper and lower bounds for the mean number of roots, where the lower bound is the square root of the generic number of complex roots, as determined by Bernstein's theorem. These bounds are derived by induction from recursive inequalities given in Theorem 4.

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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