Abstract
Some evolution equations possess infinite-dimensional prolongation Lie algebras which can be made finite-dimensional by using a bigger (non-Archimedean) field. The advantage of this is that convergence problems hardly exist in such a field. Besides that, the accompanying Lie groups can be easily constructed.
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Van Eck, H.N. A non-Archimedean approach to prolongation theory. Lett Math Phys 12, 231–239 (1986). https://doi.org/10.1007/BF00416513
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DOI: https://doi.org/10.1007/BF00416513