Abstract
We present the notion of a Laplace ladder for a discrete analogue of the Laplace equation. We introduce the adjoint of the discrete Moutard equation and a discrete counterpart of the nonlinear representation for the Goursat equation.
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Nieszposki, M. A Laplace Ladder of Discrete Laplace Equations. Theoretical and Mathematical Physics 133, 1576–1584 (2002). https://doi.org/10.1023/A:1021159129804
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DOI: https://doi.org/10.1023/A:1021159129804