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检索条件"主题词=Positive definite polynomial"
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ON LIMIT CYCLES FOR A CLASS OF DIFFERENTIAL SYSTEMS WITH positive definite polynomial
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Annals of Differential Equations 2014年 第4期30卷 466-472页
作者: Weide Zhang Hunan College of Information
In this paper, the nonexistence, existence and the number of limit cycles for a class of differential systems with positive definite polynomial are considered, and the results obtained generalize and supplement those ... 详细信息
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A Problem about the Weak Hilbert Property
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Acta Mathematica Sinica,English Series 1998年 第4期14卷 481-486页
作者: Zeng Guangxing, Departement of Mathematics and Systems Science, Nanchang University, Nanchang 330047, China Department of Mathematics and Systems Science Nanchang University 330047 Nanchang China
In this paper, we prove the main result: Let both (K, S) and (K*, S*) be preordered fields, and let (K*, S*) be a finitely generated extension of (K, S). If K* is transcendental over K, then (K*, S*) has the weak Hilb... 详细信息
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