Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Brigita Ferčec"'
Autor:
Brigita Ferčec, Jaume Giné
Publikováno v:
Electronic Journal of Qualitative Theory of Differential Equations, Vol 2024, Iss 4, Pp 1-18 (2024)
The blow-up method proves its effectiveness to characterize the integrability of the resonant saddles giving the necessary conditions to have formal integrability and the sufficiency doing the resolution of the associated recurrence differential equa
Externí odkaz:
https://doaj.org/article/a2a0eedcba0945aebe9334aba27d0e2a
Publikováno v:
Mathematics, Vol 12, Iss 9, p 1338 (2024)
We consider a nine-parameter familiy of 3D quadratic systems, x˙=x+P2(x,y,z), y˙=−y+Q2(x,y,z), z˙=−z+R2(x,y,z), where P2,Q2,R2 are quadratic polynomials, in terms of integrability. We find necessary and sufficient conditions for the existence
Externí odkaz:
https://doaj.org/article/622999d90553445ba3c32f73702a8c8d
Publikováno v:
Electronic Journal of Qualitative Theory of Differential Equations, Vol 2018, Iss 99, Pp 1-21 (2018)
The notion of $p:-q$ resonant center was introduced recently and studied by several authors. In this paper we generalize the notion of a persistent center to a persistent $p:-q $ resonant center and find conditions for existence of a persistent $p:-q
Externí odkaz:
https://doaj.org/article/bd9e34176b5e41538d4ed6e77c59ab6d
Publikováno v:
Electronic Journal of Qualitative Theory of Differential Equations, Vol 2018, Iss 37, Pp 1-27 (2018)
The concepts of persistent and weakly persistent centers were introduced in 2009 and the same concept was applied in the study of some families of differential equations in 2013. Such concept was generalized for complex planar differential systems in
Externí odkaz:
https://doaj.org/article/7840db017b1243c0a872ee8ba4ebed3f
Publikováno v:
Symmetry, Vol 13, Iss 8, p 1510 (2021)
In this paper, the linearizability of a 2:−3 resonant system with quadratic nonlinearities is studied. We provide a list of the conditions for this family of systems having a linearizable center. The conditions for linearizablity are obtained by co
Externí odkaz:
https://doaj.org/article/a68bcb353a2047acaeb641d5f89c19f0
Publikováno v:
Applied System Innovation, Vol 3, Iss 4, p 44 (2020)
After the outbreak of COVID-19 in Italy, thousands of Romanian citizens who worked in Northern Italy, Spain or Germany returned to Romania. Based on the time-dependent susceptible–infected–recovered—SIR model, this paper compares the evolution
Externí odkaz:
https://doaj.org/article/2318009bc09541188094c1765eb0a734
Autor:
Borut Zalar, architecture, Smetanova , Maribor, Slovenia, Brigita Ferčec, Matej Mencinger, Yilei Tang, mechanics, Jadranska , Ljubljana, Slovenia
Publikováno v:
Glasnik Matematicki. 55:351-366
If we view the field of complex numbers as a 2-dimensional commutative real algebra, we can consider the differential equation z'=az2+bz+c as a particular case of 𝓐- Riccati equations z'=a · (z · z)+b · z+c where 𝓐=( ℝn,·) is a commutativ
Publikováno v:
Journal of Mathematical Analysis and Applications. 515:126369
Publikováno v:
Symmetry, Vol 13, Iss 1510, p 1510 (2021)
Symmetry
Volume 13
Issue 8
Symmetry
Volume 13
Issue 8
In this paper, the linearizability of a 2:−3 resonant system with quadratic nonlinearities is studied. We provide a list of the conditions for this family of systems having a linearizable center. The conditions for linearizablity are obtained by co
Autor:
Brigita Ferčec, Jaume Giné
Publikováno v:
Applied Mathematics and Computation. 358:16-24
We provide a method to compute the necessary conditions of integrability for planar differential systems with a weak saddle at the origin. The method is used to characterize the local analytic integrability for resonant saddles of complex systems of