Published articles

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32 p, 816.9 KB Center problem for Λ-Ω differential systems / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Ramírez, Rafael Orlando (Universitat Rovira i Virgili. Departament d'Enginyeria Informàtica i Matemàtiques) ; Ramírez, Valentín (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
The Λ-Ω systems are the real planar polynomial differential equations of degree m x˙=−y(1+Λ)+xΩ,y˙=x(1+Λ)+yΩ, where Λ=Λ(x,y) and Ω=Ω(x,y) are polynomials of degree at most m−1 such that Λ(0,0)=Ω(0,0)=0. [...]
2019 - 10.1016/j.jde.2019.06.028
Journal of differential equations, Vol. 267, Issue 11 (November 2019) , p. 6409-6446  

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