Degenerate Chenciner bifurcation in generic discrete-time dynamical systems is studied in
this work. While the nondegenerate Chenciner bifurcation can be described by two …

We investigate the dynamics of a wild-type viral strain which generates mutant strains
differing in phenotypic properties for infectivity, virulence and mutation rates. We study, by …

Applying parametric controls to the 3D real-valued Maxwell–Bloch equations, we obtain a
Hamilton–Poisson system, a dissipative system with chaotic behavior, and a transitional …

We study the Hopf and the fold–Hopf bifurcations of the Rössler–type differential system x=−
y− z, y= x+ ay, z=− cz+ byz, with b= 0. We show that the classical Hopf bifurcation cannot be …

Degenerate Chenciner bifurcation in generic discrete-time dynamical systems is studied in
this work. While the non-degenerate Chenciner bifurcation can be described by 2 bifurcation …

In this work we study degenerate fold–Hopf bifurcation of codimension three in a differential
system of the form x˙=-xyz, y˙= x+ ay+ bxy, z˙= bx-cz. We prove that the classical theory of the …

L'aparició de nous virus causants de malalties està estretament lligada a l'especialització de
subpoblacions virals cap a nous tipus d'amfitrions. La modelització matemàtica proporciona …

Prima parte a tezei cuprinde detalii scurte despre evoluția carierei academice a dlui
Gheorghe Ţigan cu privire la educație, loc de muncă, activități didactice (cursuri şi …