摘要
The followunh results are proved in this paper1)If a real quadratic differential system has two strong foci,then around them therecannot appear(2n,2m)distribution of non-semi-stable limit cycles,where n and m arenatural numbers.2)If a real quadratic differential system has two strong foci of different stability,then around them there cannot appear(2n,2m)distribution of non-semi-stable limitcycles,where n and m are natural numbers.
The followunh results are proved in this paper 1)If a real quadratic differential system has two strong foci,then around them there cannot appear(2n,2m)distribution of non-semi-stable limit cycles,where n and m are natural numbers. 2)If a real quadratic differential system has two strong foci of different stability, then around them there cannot appear(2n,2m)distribution of non-semi-stable limit cycles,where n and m are natural numbers.
