Palavra-chave: SINGULARITY

VERSAL UNFOLDING STABILITY NON-SMOOTH VECTOR FIELDS IMPASSE FOLD-FOLD STRUCTURAL STABILITY DIVERGENT DIAGRAM CAMPO DE VETORES TOPOLOGICAL INVARIANT NONLINEAR ELLIPTIC BOUNDARY VALUE PROBLEMS REVERSIBILITY INVOLUTION FIXED POINT THEOREMS NONSMOOTH DYNAMICAL SYSTEMS NORMAL FORM CYCLE SLIDING VECTOR FIELD DISCONTINUOUS VECTOR FIELD HAMILTONIAN LIMIT CYCLE CENTER BIFURCATION ROBERTO ALAJMO REGULARIZATION DISCONTINUOUS DIFFERENTIAL EQUATIONS DIFFERENTIAL FORM BASIN OF ATTRACTION APOCALIPSE ATTRACTOR PERIODIC ORBIT FIM DO MUNDO TWOFOLD VECTOR FIELD RELAY SYSTEM CLOSED ORBIT ELLIPTIC BOUNDARY VALUE PROBLEMS SIGNED SOLUTIONS NUMERICAL SOLUTION SIMILARITY RESONANCE CONLEY INDEX SINGULAR PERTURBATION IMPLICIT DIFFERENTIAL EQUATIONS POROUS MEDIA ARRIVA LA FINE DEL MONDO ASYMPTOTIC STABILITY FINISMO