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A Counterexample to a Proposed Solution of Hilbert's Sixteenth Problem for Quadratic Systems

 

作者: Shi Songling,  

 

期刊: Bulletin of the London Mathematical Society  （WILEY Available online 2016）
卷期: Volume 20, issue 6  

页码: 597-599

 

ISSN:0024-6093

 

年代: 2016

 

DOI:10.1112/blms/20.6.597

 

出版商: Oxford University Press

 

数据来源: WILEY

 

摘要:

We give a counterexample to two results used by Professor Qin Yuanxun in his published proof that a quadratic vector field in the plane has at most four limit cycles.

 

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