Palavra-chave: NON-SMOOTH VECTOR FIELDS

SINGULARITY BIFURCATION CLOSED ORBIT REGULARIZATION ALGEBRAIC VARIETIES SINGULAR PERTURBATION NORMAL FORM SLOW MANIFOLD BASIN OF ATTRACTION ASYMPTOTIC STABILITY INVARIANT TORI ATTRACTOR EQUILIBRIUM LIMIT CYCLE STABILITY FOLD-FOLD TOPOLOGICAL INVARIANT REFRACTIVE VECTOR FIELD FIRST INTEGRAL STRUCTURAL STABILITY SINGULARIDADE REVERSIBILIDADE