Problem of the center for cubic differential systems with invariant straight lines, including the line at infinity, of total multiplicity five
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Ecuații diferențiale. Ecuații integrale. Alte ecuații funcționale. Diferențe finite. Calculul variațional. Analiză funcțională (243)
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SUBA, Alexandru, TURUTA (PODERIOGHIN), Silvia. Problem of the center for cubic differential systems with invariant straight lines, including the line at infinity, of total multiplicity five. In: Сучаснi проблеми диференцiальних рiвнянь та їх застосування : Матерiали мiжнародної наукової конференцiї, присвяченої 100-рiччю вiд дня народження професора С.Д. Ейдельмана, Ed. 1, 16-19 septembrie 2020, Чернiвцi. Чернiвцi: Чернівецький національний університет імені Юрія Федьковича, 2020, p. 77.
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Сучаснi проблеми диференцiальних рiвнянь та їх застосування 2020
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1, Чернiвцi, Ucraina, 16-19 septembrie 2020

Problem of the center for cubic differential systems with invariant straight lines, including the line at infinity, of total multiplicity five

CZU: 517.9

Pag. 77-77

Suba Alexandru12, Turuta (Poderioghin) Silvia1
 
1 Vladimir Andrunachievici Institute of Mathematics and Computer Science,
2 Tiraspol State University
 
 
Disponibil în IBN: 24 noiembrie 2023


Rezumat

We consider the real cubic system of differential equations x˙ = y + ax2 + cxy + fy2 + kx3 + mx2y + pxy2 + ry3 ≡ p (x, y) , y˙ = −(x + gx2 + dxy + by2 + sx3 + qx2y + nxy2 + ly3) ≡ q (x, y) , gcd(p, q) = 1, sx4 + (k+q)x3y + (m+n)x2y2 + (l+p)xy3 + ry4 /≡ 0and the homogeneous  system associated to the system (1): {x˙ = P (x, y, Z) , y˙ = Q (x, y, Z)}, where P (x, y, Z) = yZ2 + (ax2 + cxy + fy2)Z + kx3 + mx2y + pxy2 + ry3, Q (x, y, Z) = −(xZ2 + (gx2 + dxy + by2)Z + sx3 + qx2y + nxy2 + ly3). ∂x ∂y ∂x ∂y Denote X= p (x, y)  ∂ +q (x, y)  ∂ , X∞ = P (x, y, Z)  ∂ +Q (x, y, Z)  ∂ .The critical point (0, 0) of system (1) is either a focus or a center, i.e. is monodromic. The problem of distinguishing between a center and a focus is called the problem of the center or the center-focus problem.