Authors: Şubă Alexandru
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Abstract
For cubic differential system with three invariant straight lines which pass through the same point it is proved that a singular point with purely imaginary eigenvalues (weak focus) is a center if and only if the focal values g2j+1,j=1..5, vanish.Faculty of Mathematics and Informatics
State University of Moldova
MD-2009 Chisinau, Moldova
E-mail:
State University of Moldova
MD-2009 Chisinau, Moldova
E-mail:
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