Abstract
We are concerned with Runge-Kutta-Nyström methods for the integration of second order systems of the special formd 2 y/dt 2=f(y). If the functionf is the gradient of a scalar field, then the system is Hamiltonian and it may be advantageous to integrate it by a so-called canonical Runge-Kutta-Nyström formula. We show that the equations that must be imposed on the coefficients of the method to ensure canonicity are simplifying assumptions that lower the number of independent order conditions. We count the number of order conditions, both for general and for canonical Runge-Kutta-Nyström formulae.
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This research has been supported by “Junta de Castilla y León” under project 1031-89 and by “Dirección General de Investigación Científica y Técnica” under project PB89-0351.
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Calvo, M.P., Sanz-Serna, J.M. Order conditions for canonical Runge-Kutta-Nyström methods. BIT 32, 131–142 (1992). https://doi.org/10.1007/BF01995113
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DOI: https://doi.org/10.1007/BF01995113