1 matrix—variation—of—constants formula 1.1 multi—frequency and multidimensional problems 1.2 matrix—variation—of—constants formula 1.3 towards classical runge—kutta—nystrom schemes 1.4 towards arkn schemes and erkn integrators 1.4.1 arkn schemes 1.4.2 erkn integrators 1.5 towards two—step multidimensional erkn methods 1.6 towards aavf methods for multi—frequency oscillatory hamiltonian systems 1.7 towards filon—type methods for multi—frequency highly oscillatory systems 1.8 towards erkn methods for general second—order oscillatory systems 1.9 towards high—order explicit schemes for hamiltonian nonlinear wave equations 1.10 conclusions and discussions references 2 improved stormer—verlet formulae with applications 2.1 motivation 2.2 two improved stormer—verlet formulae 2.2.1 improved stormer—verlet formula 1 2.2.2 improved stormer—verlet formula 2 2.3 stability and phase properties 2.4 applications 2.4.1 application 1: time—independent schroer equations 2.4.2 application 2: non—linear wave equations 2.4.3 application 3: orbital problems 2.4.4 application 4: fermi—pasta—ulam problem 2.5 coupled conditions for explicit symplectic and symmetric multi—frequency erkn integrators for multi—frequency oscillatory hamiltonian systems 2.5.1 towards coupled conditions for explicit symplectic and symmetric multi—frequency erkn integrators 2.5.2 the analysis of bined conditions for ssmerkn integrators for multi—frequency and multidimensional oscillatory hamiltonian systems 2.6 conclusions and discussions references 3 improved filon—type asymptotic methods for highly oscillatory differential equations 3.1 motivation 3.2 improved filon—type asymptotic methods 3.2.1 oscillatory linear systems 3.2.2 oscillatory nonlinear systems 3.3 practical methods and numerical experiments 3.4 conclusions and discussions references 4 efficient energy—preserving integrators for multi—frequency oscillatory hamiitonian systems 4.1 motivation 4.2 preliminaries 4.3 the derivation of the aavf formula 4.4 some properties of the aavf formula 4.4.1 stability and phase properties 4.4.2 other properties 4.5 some integrators based on aavf formula 4.6 numerical experiments 4.7 conclusions references 5 an extended discrete gradient formula for multi—frequency oscillatory hamiltonian systems 5.1 motivation 5.2 preliminaries 5.3 an extended discrete gradient formula based on erkn integrators 5.4 convergence of the fixed—point iteration for the implicit scheme 5.5 numerical experiments 5.6 conclusions references 6 trigonometric fourier collocation methods for multi—frequency oscillatory systems 6.1 motivation 6.2 local fourier expansion 6.3 formulation of tfc methods 6.3.1 the calculation of i1j,i2j 6.3.2 discretization 6.3.3 the tfc methods 6.4 properties of the tfc methods 6.4.1 the order 6.4.2 the order of energy preservation and quadratic invariant preservation 6.4.3 convergence analysis of the iteration 6.4.4 stability and phase properties 6.5 numerical experiments 6.6 conclusions and discussions references 7 error bounds for explicit erkn integrators for multi—frequency oscillatory systems 7.1 motivation 7.2 preliminaries for explicit erkn integrators 7.2.1 explicit erkn integrators and order conditions 7.2.2 stability and phase properties 7.3 preliminary error analysis 7.3.1 three elementary assumptions and a gronwalls lemma 7.3.2 residuals of erkn integrators 7.4 error bounds 7.5 an explicit third order integrator with minimal dispersion error and dissipation error 7.6 numerical experiments 7.7 conclusions references 8 error analysis of explicit tserkn methods for highly oscillatory systems 8.1 motivation 8.2 the formulation of the new method 8.3 error analysis 8.4 stability and phase properties 8.5 numerical experiments 8.6 conclusions references 9 highly accurate explicit symplectic erkn methods for multi—frequency oscillatory hamiltonian systems 9.1 motivation 9.2 preliminaries 9.3 explicit symplectic erkn methods of order five with some small residuals 9.4 numerical experiments 9.5 conclusions and discussions references 10 multidimensional arkn methods for general multi—frequency oscillatory second—order iv 10.1 motivation 10.2 multidimensional arkn methods and the correspon order conditions 10.3 arkn methods for general multi—frequency and multidimensional oscillatory systems 10.3.1 construction of multidimensional arkn methods 10.3.2 stability and phase properties of multidimensional arkn methods 10.4 numerical experiments 10.5 conclusions and discussions references 11 a simplified nystrom—tree theory for erkn integrators solving oscillatory systems 11.1 motivation 11.2 erkn methods and related issues 11.3 higher order derivatives of vector—valued functions 11.3.1 taylor series of vector—valued functions 11.3.2 kronecker inner product 11.3.3 the higher order derivatives and kronecker inner product 11.3.4 a definition associated with the elementary differentials 11.4 the set of simplified spe extended nystrrm trees 11.4.1 tree set ssent and related mappings 11.4.2 the set ssent and the set of classical sn—trees 11.4.3 the set ssent and the set sent 11.5 b—series and order conditions 11.5.1 b—series 11.5.2 order conditions 11.6 conclusions and discussions references 12 general local energy—preserving integrators for multi—symplectic hamiltonian pdes 12.1 motivation 12.2 multi—symplectic pdes and energy—preserving continuous runge—kutta methods 12.3 construction of local energy—preserving algorithms for hamiltonian pdes 12.3.1 eudospectral spatial discretization 12.3.2 gauss—legendre collocation spatial discretization 12.4 local energy—preserving schemes for coupled nonlinear schrrer equations 12.5 local energy—preserving schemes for 2d nonlinear schrrer equations 12.6 numerical experiments for coupled nonlinear schrrers equations 12.7 numerical experiments for 2d nonlinear schr6er equations 12.8 conclusions references conference photo(appendix) index
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