A New Approach to the Algebraic Structures for Integration Methods |
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Authors: | J C Butcher T M H Chan |
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Institution: | (1) Department of Mathematics, The University of Auckland, Private Bag 92019, Auckland, New Zealand;(2) Department of Information Management, National Taichung Institute of Technology, Taichung, Taiwan |
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Abstract: | The analysis of compositions of Runge-Kutta methods involves manipulations of functions defined on rooted trees. Existing formulations due to Butcher 1972], Hairer and Wanner 1974], and Murua and Sanz-Serna 1999], while equivalent, differ in details. The subject of the present paper is a new recursive formulation of the composition rules. This both simplifies and extends the existing approaches. Instead of using the order conditions based on trees, we propose the construction of the order conditions using a suitably chosen basis on the tree space. In particular, the linear structure of the tree space gives a representation of the C and D simplifying assumptions on trees which is not restricted to Runge-Kutta methods. A proof of the group structure of the set of elementary weight functions satisfying the D simplifying assumptions is also given is this paper. |
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Keywords: | Elementary weight function B-series composition rule C simplifying assumptions D simplifying assumptions tree space forest space dual space dual forest |
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