Zero-nonzero and real-nonreal sign determination

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• 作者：Daniel Perrucci ; Marie-Fran?oise Roy
• 关键词：14P10 ; 14Q20
• 刊名：Linear Algebra and its Applications
• 出版年：2013
• 出版时间：15 November, 2013
• 年：2013
• 卷：439
• 期：10
• 页码：3016-3030
• 全文大小：288 K

文摘

We consider first the zero-nonzero determination problem, which consists in determining the list of zero-nonzero conditions realized by a finite list of polynomials on a finite set with C an algebraic closed field. We describe an algorithm to solve the zero-nonzero determination problem and we perform its bit complexity analysis. This algorithm, which is in many ways an adaptation of the methods used to solve the more classical sign determination problem, presents also new ideas which can be used to improve sign determination. Then, we consider the real-nonreal sign determination problem, which deals with both the sign determination and the zero-nonzero determination problem. We describe an algorithm to solve the real-nonreal sign determination problem, we perform its bit complexity analysis and we discuss this problem in a parametric context.