## Differential Equations and Dynamical SystemsMathematics is playing an ever more important role in the physical and biological sciences, provoking a blurring of boundaries between scientific disciplines and a resurgence of interest in the modern as well as the clas sical techniques of applied mathematics. This renewal of interest, both in research and teaching, has led to the establishment of the series: Texts in Applied Mathematics (TAM). The development of new courses is a natural consequence of a high level of excitement on the research frontier as newer techniques, such as numerical and symbolic computer systems, dynamical systems, and chaos, mix with and reinforce the traditional methods of applied mathematics. Thus, the purpose of this textbook series is to meet the current and future needs of these advances and encourage the teaching of new courses. TAM will publish textbooks suitable for use in advanced undergraduate and beginning graduate courses, and will complement the Applied Math ematical Sciences (AMS) series, which will focus on advanced textbooks and research level monographs. |

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### Contents

III | 1 |

V | 6 |

VI | 10 |

VII | 16 |

VIII | 20 |

IX | 28 |

X | 32 |

XI | 39 |

XXXIV | 220 |

XXXV | 234 |

XXXVI | 244 |

XXXVII | 253 |

XXXVIII | 264 |

XXXIX | 267 |

XL | 293 |

XLI | 299 |

XII | 51 |

XIII | 60 |

XIV | 65 |

XVI | 70 |

XVII | 79 |

XVIII | 87 |

XIX | 95 |

XX | 101 |

XXI | 105 |

XXII | 119 |

XXIII | 129 |

XXIV | 136 |

XXV | 147 |

XXVI | 154 |

XXVII | 163 |

XXVIII | 171 |

XXIX | 181 |

XXX | 182 |

XXXI | 191 |

XXXII | 202 |

XXXIII | 211 |

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### Common terms and phrases

analytic system behavior bifurcation diagram bifurcation surface bifurcation value bifurcations that occur center manifold Chapter Cl(E codimension compute Corollary defined determined differential equation dynamical system eigenvalues eigenvectors equilibrium point family of periodic family of rotated field f finite number flow given global phase portrait Hamiltonian system homoclinic loop homoclinic orbit Hopf bifurcation hyperbolic initial value problem Lemma Lienard system limit cycles linear system maximal interval Melnikov function neighborhood node nonhyperbolic critical point nonlinear system normal form one-parameter family open subset origin parameter periodic orbit planar systems Poincare map Poincare sphere Poincare-Bendixson Theorem point XQ polynomial PROBLEM SET proof rotated vector fields saddle saddle-node bifurcation satisfies Section 4.4 separatrix cycle shown in Figure stable and unstable stable limit cycle structurally stable sufficiently small system in Example system x Takens-Bogdanov bifurcation topologically equivalent trajectories two-dimensional universal unfolding unstable manifolds weak focus zero