Abstract
After an introduction to some aspects of bidifferential calculus on associative algebras, we focus on the notion of a “symmetry” of a generalized zero curvature equation and derive Bäcklund and (forward, backward and binary) Darboux transformations from it. We also recall a matrix version of the binary Darboux transformation and, inspired by the so-called Cauchy matrix approach, present an infinite system of equations solved by it. Finally, we sketch recent work on a deformation of the matrix binary Darboux transformation in bidifferential calculus, leading to a treatment of integrable equations with sources.
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Notes
- 1.
Setting alternatively \(A=0\) and keeping B, corresponds to an exchange of \(\mathrm {d}\) and \(\bar{\mathrm {d}}\) in the following equations.
- 2.
- 3.
Here we depart from the previous scheme since \(\tilde{J}_1 = J_1 + \mathrm {d} ( \phi \, \tilde{\chi }_0)\), where \(J_1 = \bar{D} \tilde{\chi }_0\). \(\tilde{J}_1\) is not annihilated by \(\bar{D}\) if \(\phi \ne 0\).
- 4.
- 5.
F M-H had a very illuminating discussion about all this with Martin Bordemann in June 2000.
- 6.
There is a wrong factor in front of the cubic nonlinearities in (4.5) of [7].
- 7.
We are grateful to Dmitry Demskoi and Maxim Pavlov for informing us about this.
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Dimakis, A., Müller-Hoissen, F. (2020). Differential Calculi on Associative Algebras and Integrable Systems. In: Silvestrov, S., Malyarenko, A., Rančić, M. (eds) Algebraic Structures and Applications. SPAS 2017. Springer Proceedings in Mathematics & Statistics, vol 317. Springer, Cham. https://doi.org/10.1007/978-3-030-41850-2_16
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