Abstract
This work establishes the existence of addition theorems and double-angle formulas for \({\mathcal {C}}^k\) real scalar functions. Moreover, we determine necessary and sufficient conditions for a bivariate function to be an addition formula for a \({\mathcal {C}}^k\) real function. The double-angle formulas allow us to generate a duplication algorithm, which can be used as an alternative to the classical numerical methods to obtain an approximation for the solution of an ordinary differential equation. We demonstrate that this algorithm converges uniformly in any compact domain contained in the maximal domain of that solution. Finally, we carry out some numerical simulations showing a good performance of the duplication algorithm when compared with standard numerical methods.
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Acknowledgements
Support from Research Agencies of Chile is acknowledged. They came in the form of research Projects 11160224 of the Chilean national agency FONDECYT and the UBB Project 2020157 IF/R. The author J.L.Z. acknowledges support from CONICYT PhD/2017-21170836 and Proyecto Plurianual AIUE 1955 UBB.
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Appendix A: Double-angle formula Taylor expansion
Appendix A: Double-angle formula Taylor expansion
The Taylor expansion of the double-angle formula is obtained by following the strategy given in Sect. 3. Here we include the expression of the derivatives up to the 10th order
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Crespo, F., Rebollo-Perdomo, S. & Zapata, J.L. Addition theorems for \({\mathcal {C}}^k\) real functions and applications in ordinary differential equations. Aequat. Math. 96, 431–452 (2022). https://doi.org/10.1007/s00010-021-00822-w
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DOI: https://doi.org/10.1007/s00010-021-00822-w
Keywords
- Addition theorem
- \({\mathcal {C}}^k\) real functions
- Duplication algorithm
- Ordinary differential equations