Exploració per autor "Pantazi, Chara"
Ara es mostren els items 20-32 de 32
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On planar polynomial vector fields with elementary first integrals
Christopher, Colin; Pantazi, Chara; Llibre Saló, Jaume; Walcher, Sebastian (2019-10-05)
Article
Accés obertWe show that under rather general conditions a polynomial differential system having an elementary first integral already must admit a Darboux first integral, and we explicitly characterize the vector fields in this class. ... -
On the integrability of polynomial fields in the plane by means of Picard-Vessiot theory
Lázaro Ochoa, José Tomás; Morales Ruíz, Juan José; Acosta Humánez, Primitivo Belén; Pantazi, Chara (2012-01-12)
Report de recerca
Accés obertWe study the integrability of polynomial vector fields using Galois theory of linear differential equations when the associated foliations is reduced to a Riccati type foliation. In particular we obtain integrability results ... -
On the integrability of polynomial vector fields in the plane by means of Picard-Vessiot theory
Acosta-Humànez, Primitivo; Lázaro Ochoa, José Tomás; Morales Ruiz, Juan José; Pantazi, Chara (American Institute of Mathematical Sciences, 2015-05-01)
Article
Accés obertWe study the integrability of polynomial vector fields using Galois theory of linear differential equations when the associated foliations is reduced to a Riccati type foliation. In particular we obtain integrability results ... -
Online engineering mathematics course : development and implementation of a successful project
Soares, Filomena; Lopes, Ana Paula; Cellmer, Anna; Uukkivi, Anne; Serrat Piè, Carles; Pantazi, Chara; Feniser, Cristina; Safiulina, Elena; Serdean, Florina M.; Kierkosz, Igor; Kelly, Gerald; Cymerman, Joanna; Brown, Ken; Alier Forment, Marc; Bruguera Padró, Maria Montserrat; Estela Carbonell, M. Rosa; Labanova, Oksana; Bocanet, Vlad I.; Volodymyr, Sushch; Martin, Errol (International Association of Technology, Education and Development (IATED), 2022)
Comunicació de congrés
Accés obertAccording to the New UNESCO global survey studying the effect of Covid-19 on higher education (2021) the pandemic has had an impact on higher education systems in terms of access and quality of teaching and learning. ... -
Phase portraits of separable Hamiltonian systems
Guillamon Grabolosa, Antoni; Pantazi, Chara (Universidad de Sevilla, 2007-09)
Text en actes de congrés
Accés obertWe study some generalizations of potential Hamiltonian systems $(H(x, y) = y^2 + F(x))$ with one degree of freedom. In particular, we are interested in Hamiltonian systems with Hamiltonian functions of type $H(x, y) = ... -
Polynomial differential systems having a given Darbouxian first integral
Llibre Saló, Jaume; Pantazi, Chara (Elsevier, 2004)
Article
Accés obertThe Darbouxian theory of integrability allows to determine when a polynomial differential system in C2 has a first integral of the kind f λ1 1 ···f λp p exp(g/h) where fi , g and h are polynomials in C[x, y], and λi ∈ C ... -
Pràctiques de Minitab, problemes guia i preguntes d'autoavaluacions
Ferrer Biosca, Alberto; Pantazi, Chara; Serrat Piè, Carles (Universitat Politècnica de Catalunya, 2015-09-28)
Apunts
Accés obert -
Qualitative study of a model with Rastall gravity
Pantazi, Chara; Llibre Saló, Jaume (2020-12-17)
Article
Accés obertWe consider the Rastall theory for the flat Friedmann-Robertson-Walker Universe filled with a perfect fluid that satisfies a linear equation of state. The corresponding dynamical system is a two dimensional system of ... -
Semiclassical quantification of some two degree of freedom potentials: A differential Galois approach
Acosta Humánez, Primitivo Belen; Lázaro Ochoa, José Tomás; Pantazi, Chara; Morales Ruiz, Juan José (2024-01-01)
Article
Accés obertIn this work we explain the relevance of the Differential Galois Theory in the semiclassical (or WKB) quantification of some two degree of freedom potentials. The key point is that the semiclassical path integral quantification ... -
Some inverse problems
Christopher, Colin; Llibre Saló, Jaume; Pantazi, Chara; Walcher, Sebastian (2011-07-06)
Report de recerca
Accés restringit per política de l'editorialThe Darboux theory of integrability for planar polynomial di®erential equations is a classical ¯eld, with connections to Lie symmetries, di®erential algebra and other areas of mathematics. In the present paper we introduce ... -
Symmetries of homogeneous cosmologies
Cotsakis, Spiros; Leach, P. G. L.; Pantazi, Chara (2004)
Article
Accés obertWe reformulate the dynamics of homogeneous cosmologies with a scalar field matter source with an arbitrary self- interaction potential in the language of jet bundles and extensions of vector fields. In this framework, the ... -
The Picard-Fuchs equations for complete hyperelliptic integrals of even order curves, and the actions of the generalized Neumann system
Fedorov, Yuri; Pantazi, Chara (2014-03-01)
Article
Accés obertWe consider a family of genus 2 hyperelliptic curves of even order and obtain explicitly the systems of 5 linear ordinary differential equations for periods of the corresponding Abelian integrals of first, second, and third ... -
Three-dimensional Lotka–Volterra systems with 3:-1:2-resonance
Aziz, Waleed; Christopher, Colin; Llibre Saló, Jaume; Pantazi, Chara (2021-08)
Article
Accés obertWe study the local integrability at the origin of a nine-parameter family of three-dimensional Lotka–Volterra differential systems with (3:- 1:2)-resonance. We give necessary and sufficient conditions on the parameters of ...