Palavra-chave: PERIODIC ORBIT

INVARIANT TORUS DIFEOMORFISMO INVARIANT MANIFOLD ESTABILIDADE ESTRUTURAL HETEROCLINIC LOOP PONTO CRITICO VECTOR FIELD NORMAL FORM AVERAGING ISOCHRONOUS CENTER FILIPPOV SYSTEMS SINGULARITY REVERSIBILITY DIFFEOMORPHISM BIFURCATION NONSMOOTH DYNAMICAL SYSTEMS BIFURCACAO MINIMAL SET LIMIT CYCLE RESONANCE CAMPO VETORIAL DISCONTINUOUS DIFFERENTIAL EQUATIONS CYCLE AVERAGING METHOD HAMILTONIAN DISCONTINUOUS VECTOR FIELD FOLD-FOLD