Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2010-08-08
Nonlinear Sciences
Exactly Solvable and Integrable Systems
15 pages, 0 figure
Scientific paper
The constraints for evolution equations with some special form of Lax pair are first investigated. We show by examples how the method is rooted in the classical literatures and how the ignored constraints provide nontrivial solutions. Then we showed, by the example of the KdV, how this special form of Lax pair may be found by the method of EW. At last we propose how constraints should be imposed for general Lax pairs including nonlinear ones, with which the true Lax pairs and the fake ones can be distinguished easily. The linearity nature in integrable partial differential equations seems to have been revealed.
Biao Li
SenYue Lou
YuQi Li
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