Oxana Cerba Diaconescu

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In this article, we consider the class QSL +w,∞ 4 of all real quadratic differential systems dx dt = p(x, y), dy dt = q(x, y) with gcd(p, q) = 1, having invariant lines of total multiplicity four and two complex and one real infinite singularities. We first construct compactified canonical forms for the class QSL +w,∞ 4 so as to include limit points in the(More)
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