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 Transverse homoclinic orbit bifurcated from a homoclinic manifold by the higher order melnikov integrals Bin Long,Chang Rong Zhu Keywords:Homoclinic manifold；Lyapunov-Schmidt reduction； Exponential dichotomies；Melnikov integral；Chaos Abstract: Consider an autonomous ordinary differential equation in $\mathbb{R}^n$ that has a $d$ dimensional homoclinic solution manifold $W^H$ which can be locally parametrized by $(\alpha,\theta)\in \mathbb{R}^{d-1}\times \mathbb{R}$. We study bifurcation of the homoclinic solution manifold $W^H$ under periodic perturbations. Using exponential dichotomies and Lyapunov-Schmidt reduction, we obtain the higher order Melnikov function. For a fixed $(\alpha_0,\theta_0)$ on $W^H$, if the Melnikov function have a simple zero, then the perturbed system can have transverse homoclinic solutions near $W^H$.