Palavra-chave: SINGULARITY

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