Abstract
In this work, we present a new approach to find non-local symmetries and contact symmetries from the admitted Lie point symmetries of the considered system of nonlinear differential equations. By introducing a new function in both the numerator and denominator in the relation which relates the \(\lambda \)-symmetry function and the Lie point symmetry characteristics, we generate non-local symmetries as well as contact symmetries. To do so, we have to define another function \(g_3\) and then we identify two different cases, where the function \(g_3=0\) and \(g_3 \ne 0\). To validate the results, we consider the Ricatti chain as an example and find the non-local and contact symmetries admitted by the first four of the underlying equations. We also find the contact symmetries admitted by the well-known Mathews–Lakshmanan oscillator equation.
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Acknowledgements
RMS is funded by the Centre for Computational Modeling, Chennai Institute of Technology, India, vide funding number CIT/CCM/2022/RP-005. VKC thanks DST, New Delhi for computational facilities under the DST-FIST Programme (Grant No. SR/FST/PS-1/2020/135). The work of VKC is also supported by SERB-DST-MATRICS (Grant No. MTR/2018/000676) and DST-CRG project (Grant No. CRG/2020/004353). The work of MS forms part of a research project sponsored by NBHM, Government of India, under the Grant No. 02011/20/2018 NBHM (R.P)/R &DII/15064. The work of ML is supported by a DST-SERB National Science Chair.
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Mohanasubha, R., Chandrasekar, V.K., Senthilvelan, M. et al. Finding non-local and contact/dynamical symmetries of Riccati chain. Pramana - J Phys 97, 30 (2023). https://doi.org/10.1007/s12043-022-02496-8
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DOI: https://doi.org/10.1007/s12043-022-02496-8
Keywords
- Integrability
- nonlinear ordinary differential equations
- \(\lambda \)-symmetries
- Lie symmetries
- Riccati chain