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摘要: 构造了一个基于3×3 矩阵谱问题的 Lax 对, 求出了该 Lax 对所对应的梯队. 该梯队不仅包含了 KdV 和 mKdV 方程, 还包含了高阶 NLS 方程. 此外, 根据谱问题的规范变换, 导出了此谱问题的 Darboux 变换, 并得出了其精确解.Abstract: The Lax pair of a 3×3 matrix spectral problem was constructed and the hierarchy corresponding to this Lax pair was also obtained. This hierarchy includes not only KdV and mKdV equations but also high-order NLS equation. Besides, with the help of the gauge transformation of spectral problem, the Darboux transformation of this $3\times3$ matrix spectral problem was deduced and its explicit solutions were given.
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