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Computation of conditions of the center for a system with quadratic nonlinearities. (Russian) Zbl 0639.34024
For a system of two polynomial differential equations of second degree explicit conditions in terms of the 10 coefficients are given for the singular point at the origin to be a center. The general method proposed by the second author is used.
Reviewer: A.Halanay
MSC:
34C05 Topological structure of integral curves, singular points, limit cycles of ordinary differential equations
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