Armengol Gasull

发表

Periodic points of a Landen transformation

Armengol Gasull, Mireia Llorens, V'ictor Manosa, 2018, Commun. Nonlinear Sci. Numer. Simul..

Persistence of periodic traveling waves and Abelian integrals

Anna Geyer, Armengol Gasull, V'ictor Manosa, 2021, Journal of Differential Equations.

Discrete Melnikov functions

Armengol Gasull, Claudia Valls, 2021 .

Pointwise periodic maps with quantized first integrals

Anna Cima, Armengol Gasull, V'ictor Manosa, 2020, Commun. Nonlinear Sci. Numer. Simul..

Approximating Mills ratio

Armengol Gasull, Frederic Utzet, F. Utzet, 2013, 1307.3433.

Small-Amplitude Limit Cycles in Liénard Systems via Multiplicity

Joan Torregrosa, Armengol Gasull, A. Gasull, 1999 .

A Darboux-type Theory of Integrability for Discrete Dynamical Systems

Víctor Mañosa, Armengol Gasull, A. Gasull, 2002 .

Center-focus and isochronous center problems for discontinuous differential equations

Armengol Gasull, B. Coll, R. Prohens, 2000 .

Phase portrait of Hamiltonian systems with homogeneous nonlinearities

Víctor Mañosa, Antoni Guillamon, Armengol Gasull, 2000 .

The third order Melnikov function of a quadratic center under quadratic perturbations

Armengol Gasull, Adriana Buica, Jiazhong Yang, 2007 .

The focus-centre problem for a type of degenerate system

Jaume Llibre, Víctor Mañosa, Francesc Mañosas, 2000 .

Quadratic systems with a unique finite rest point

Jaume Llibre, Armengol Gasull, J. Llibre, 1988 .

THE PERIOD FUNCTION AND THE HARMONIC BALANCE METHOD

Armengol Gasull, A. Gasull, Johanna D. Garc'ia-Saldana, 2013, 1310.1215.

Upper bounds for the number of zeroes for some Abelian integrals

Joan Torregrosa, Armengol Gasull, J. Tom'as L'azaro, 2010 .

Maxima of Gamma random variables and other Weibull-like distributions and the Lambert $$\varvec{W}$$W function

Armengol Gasull, José A. López-Salcedo, Frederic Utzet, 2015 .

A Relation between Small Amplitude and Big Limit Cycles

Joan Torregrosa, Armengol Gasull, A. Gasull, 2001 .

Limit cycles and Lie symmetries

Antoni Guillamon, Emilio Freire, Armengol Gasull, 2007 .

Seeking Darboux Polynomials

Antoni Ferragut, Armengol Gasull, A. Gasull, 2015 .

Quadratic and Cubic Systems with Degenerate Infinity

Armengol Gasull, R. Prohens, A. Gasull, 1996 .

On the Chebyshev property for a new family of functions

Joan Torregrosa, Armengol Gasull, J. Tomás Lázaro, 2012 .

A polynomial counterexample to the Markus-Yamabe conjecture

Engelbert Hubbers, Francesc Mañosas, Anna Cima, 1997 .

Limit cycles appearing from the perturbation of a system with a multiple line of critical points

Joan Torregrosa, Armengol Gasull, Chengzhi Li, 2012 .

On Quadratic Systems with a Degenerate Critical Point

Armengol Gasull, R. Prohens, A. Gasull, 1996 .

Global behaviour of the period function of the sum of two quasi-homogeneous vector fields

M. J. Álvarez, Armengol Gasull, R. Prohens, 2017 .

Degenerate hopf bifurcations in discontinuous planar systems

Armengol Gasull, R. Prohens, A. Gasull, 2001 .

The Center Problem for Discontinuous Liénard Differential Equation

Armengol Gasull, R. Prohens, A. Gasull, 1999 .

Limit cycles for a class of Abel equations

Jaume Llibre, Armengol Gasull, J. Llibre, 1990 .

Limit cycles of vector fields of the form ()

Jaume Llibre, Armengol Gasull, Jorge Sotomayor, 1987 .

Some theorems on the existence, uniqueness, and nonexistence of limit cycles for quadratic systems

Jaume Llibre, Armengol Gasull, J. Llibre, 1987 .

Bifurcation of critical periods from the rigid quadratic isochronous vector field

Yulin Zhao, Armengol Gasull, Yulin Zhao, 2008 .

Chordal quadratic systems

Jaume Llibre, Armengol Gasull, J. Llibre, 1986 .

On the number of limit cycles bifurcating from a non-global degenerated center☆

Armengol Gasull, Chengzhi Li, Changjian Liu, 2007 .

On the critical periods of perturbed isochronous centers

Jiang Yu, Armengol Gasull, A. Gasull, 2008 .

Period function for perturbed isochronous centres

Antoni Guillamon, Emilio Freire, Armengol Gasull, 2002 .

Algebraic Properties of the Liapunov and Period Constants

Víctor Mañosa, Francesc Mañosas, Anna Cima, 1997 .

Limit cycles in the Holling-Tanner model

Joan Torregrosa, Robert E. Kooij, Armengol Gasull, 1997 .

Generating limit cycles from a nilpotent critical point via normal forms

M. J. Álvarez, Armengol Gasull, A. Gasull, 2006 .

An Explicit Expression of the First Liapunov and Period Constants with Applications

Víctor Mañosa, Antoni Guillamon, Armengol Gasull, 1997 .

On the number of critical periods for planar polynomial systems

Anna Cima, Armengol Gasull, Paulo Ricardo da Silva, 2008 .

Cyclicity of a family of vector fields

Francesc Mañosas, Anna Cima, Armengol Gasull, 1995 .

A new algorithm for the computation of the Lyapunov constants for some degenerated critical points

Joan Torregrosa, Armengol Gasull, A. Gasull, 2001 .

Effective computation of the first Lyapunov quantities for a planar differential equation

Armengol Gasull, R. Prohens, A. Gasull, 1997 .

Chini Equations and Isochronous Centers in Three-Dimensional Differential Systems

Marc Chamberland, Armengol Gasull, M. Chamberland, 2010 .

Maxima of Gamma random variables and other Weibull-like distributions and the Lambert W function

Armengol Gasull, Frederic Utzet, F. Utzet, 2015 .

Further considerations on the number of limit cycles of vector fields of the form ()

Jaume Llibre, Armengol Gasull, Jorge Sotomayor, 1987 .

Differential Equations Defined by the Sum of two Quasi-Homogeneous Vector Fields

Armengol Gasull, R. Prohens, A. Gasull, 1997, Canadian Journal of Mathematics.

A theoretical basis for the Harmonic Balance Method

Armengol Gasull, A. Gasull, Johanna D. Garc'ia-Saldana, 2012, 1202.1791.

Monodromy and Stability of a Class of Degenerate Planar Critical Points

Víctor Mañosa, Francesc Mañosas, Armengol Gasull, 2002 .