Palavra-chave: PERIODIC ORBIT

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