Backlund Transformations for Darboux Integrable Differential Systems: Examples and Applications

In the article arXiv:1108.5443 we established a general group-theoretical approach to the construction of Bäcklund transformations. We then showed how this construction can be applied to construct Bäcklund transformation between equations which are Darboux integrable. Here we give a number of detailed examples and new applications which demonstrate the theory. In particular our final example demonstrates how our group theoretical approach produces all the Bäcklund transformations in arXiv:0707.4408. We also prove, using group methods, a non-existence theorem for Bäcklund transformatons which disagrees with part 2 of Theorem 1 in arXiv:0707.4408.

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