-smoothness of invariant fiber bundles for dynamic equations on measure chains.
A 3D Smale horseshoe in a hyperchaotic discrete-time system.
A certain integral-recurrence equation with discrete-continuous auto-convolution
Laplace transform and some of the author’s previous results about first order differential-recurrence equations with discrete auto-convolution are used to solve a new type of non-linear quadratic integral equation. This paper continues the author’s work from other articles in which are considered and solved new types of algebraic-differential or integral equations.
A characterization of Cauchy kernels.
A Characterization of Linear Difference Equations Which are Solvable by Elementary Operations.
A class of infinite series including terms of generalized sequences.
A correction to “Cayley's problem”, AM 35 (1990) No. 2, 140-146
A discrete equivalent of the logistic equation.
A discrete Hardy-Laptev-Weidl-type inequality and associated Schrödinger-type operators.
A discrete predator-prey system with age-structure for predator and natural barriers for prey
We analyze a two species discrete predator-prey model in which the prey disperses between two patches of a heterogeneous environment with barriers and the mature predator disperses between the patches with no barrier. By using the discrete dynamical system generated by a monotone, concave maps for subcommunity of prey, we obtain the subcommunity of prey exists an equilibrium which attracts all positive solutions, and using the stability trichotomy results on the monotone and continuous operator,...
A discrete predator-prey system with age-structure for predator and natural barriers for prey
We analyze a two species discrete predator-prey model in which the prey disperses between two patches of a heterogeneous environment with barriers and the mature predator disperses between the patches with no barrier. By using the discrete dynamical system generated by a monotone, concave maps for subcommunity of prey, we obtain the subcommunity of prey exists an equilibrium which attracts all positive solutions, and using the stability trichotomy results on the monotone and continuous operator,...
A discrete two-sector economic growth model.
A dominant height growth model for eucalyptus plantations in Portugal
Eucalyptus globulus Labill is one of the most important economic forest species in Portugal, occupying an area of 875.10³ ha in a total forest area of 3346.10³ ha (Tomé et al., 2007). The main goal of this study is to develop a dominant height growth model for Eucalyptus, applicable throughout the country, representing an improve of the curves that are part of the whole stand model existing in Portugal, the GLOBULUS model (Tomé et al., 2001). The dominant height growth model will be built on a biological...
A first order -difference system for the -type Jackson integral and its applications.
A focal boundary value problem for difference equations.
A functional equation characterizing cubic polynomials and its stability.
A functional-analytic method for the study of difference equations.
A Galois -groupoid for -difference equations
We first recall Malgrange’s definition of -groupoid and we define a Galois -groupoid for -difference equations. Then, we compute explicitly the Galois -groupoid of a constant linear -difference system, and show that it corresponds to the -difference Galois group. Finally, we establish a conjugation between the Galois -groupoids of two equivalent constant linear -difference systems, and define a local Galois -groupoid for Fuchsian linear -difference systems by giving its realizations.
A general discrete time model of population dynamics in the presence of an infection.
A generalization of Constantin's integral inequality and its discrete analogue.