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Algebraic Polynomials with Random Coefficients with Binomial and Geometric Progressions

机译:具有二项式和几何级数的随机系数的代数多项式

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摘要

The expected number of real zeros of an algebraic polynomial a_0+1x+2x~2+···+a_nx~nwith randomcoefficient ai, j = 0, 1, 2, ... , n is known. The distribution of the coefficients is often assumed to beidentical albeit allowed to have different classes of distributions. For the nonidentical case, therehas been much interest where the variance of the jth coefficient is var (a1) = ( ). It is shownthat this class of polynomials has significantly more zeros than the classical algebraic polynomialswith identical coefficients. However, in the case of nonidentically distributed coefficients it isanalytically necessary to assume that the means of coefficients are zero. In this work we study acase when the moments of the coefficients have both binomial and geometric progression elements.That is we assume E(aj) = (7)1,1+1 and var (a1) = (7)o-21. We show how the above expectednumber of real zeros is dependent on values of a2 and 14 in various cases.
机译:已知代数多项式a_0 + 1x + 2x〜2 +··+ a_nx〜n的期望实零数(随机系数为ai,j = 0、1、2,...,n)。尽管允许具有不同类别的分布,但是通常假定系数的分布是相同的。对于不相同的情况,第j个系数的方差为var(a1)=()引起了很多关注。结果表明,与具有相同系数的经典代数多项式相比,此类多项式具有明显更多的零。但是,在系数分布不相同的情况下,从分析上讲,必须假设系数的均值为零。在这项工作中,我们研究了系数矩同时具有二项式和几何级数元素的情况,即假设E(aj)=(7)1,1 + 1和var(a1)=(7)o-21。我们展示了上述期望的实零数在各种情况下如何取决于a2和14的值。

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