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A simple proof of the Routh test

机译:Routh检验的简单证明

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摘要

An elementary proof of the classic Routh method for counting the number of left half-plane and right half-plane zeros of a real coefficient polynomial P/sub n/(s) of degree n is given. Such a proof refers to the polynomials P/sub i/(s) of degree i/spl les formed from the entries of the rows of order i and i-1 of the relevant Routh array. In particular, it is based on the consideration of an auxiliary polynomial P/sub i/(s; q), linearly dependent on a real parameter q, which reduces to either polynomial P/sub i/(s) or to polynomial P/sub i-1/(s) for particular values of q. In this way, it is easy to show that i-1 zeroes of P/sub i/(s) lie in the same half-plane as the zeros of P/sub i/(s), and the remaining zero lies in the left or in the right half-plane according to the sign of the ratio of the leading coefficients of P/sub i/(s) and P/sub i-1/(s). By successively applying this property to all pairs of polynomials in the sequence, starting from P/sub o/(s) and P/sub 1/(s), the standard rule for determining the zero distribution of P/sub n/(s) is immediately derived.
机译:给出了经典劳斯方法的基本证明,该方法用于对次数为n的实系数多项式P / sub n /(s)的左半平面和右半平面零进行计数。这样的证明指的是由相关Routh数组的i和i-1阶的行的条目形成的次数为i / spl les / n的多项式P / sub i /。特别地,它基于对辅助多项式P / sub i /(s; q)的考虑,该线性多项式取决于实数参数q,该实数参数q减小为多项式P / sub i /(s)或多项式P /子i-1 / s适用于q的特定值。这样,很容易证明P / sub i /(s)的i-1个零与P / sub i /(s)的零在同一半平面上,而其余零在根据P / sub i /(s)和P / sub i-1 /(s)的前导系数之比的符号,选择左或右半平面。通过从P / sub o /(s)和P / sub 1 /(s)开始连续地将此属性应用于序列中的所有对多项式,确定P / sub n /(s的零分布)的标准规则)立即得出。

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