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arXiv 1109.1689nlin.SI
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离散时空上的仿射有限李代数与可积Toda场方程

Affine and Finite Lie Algebras and Integrable Toda Field Equations on Discrete Space-Time

Rustem Garifullin, Ismagil Habibullin, Marina Yangubaeva

摘要:

提出了对应于任意单李代数或仿射李代数的Cartan矩阵的差分-差分系统。在代数$A_N$,$B_N$,$C_N$,$G_2$,$D_3$,$A_1^{(1)}$,$A_2^{(2)}$,$D^{(2)}_N$的情形下,证明了这些系统是可积的.对于$A_2$,$A_1^{(1)}$,$A_2^{(2)}$代数所对应的系统,找到了它们的广义对称性,对于$A_2$,$B_2$,$C_2$,$G_2$,$D_3$代数所对应的系统,找到了它们的独立积分完备集,给出了$A_N$,$B_N$,$C_N$,$A^{(1)}_1$,$D^{(2)}_N$代数所对应的差分-差分系统的Lax表示.

英文摘要:

Difference-difference systems are suggested corresponding to the Cartan matrices of any simple or affine Lie algebra. In the cases of the algebras $A_N$, $B_N$, $C_N$, $G_2$, $D_3$, $A_1^{(1)}$, $A_2^{(2)}$, $D^{(2)}_N$ these systems are proved to be integrable. For the systems corresponding to the algebras $A_2$, $A_1^{(1)}$, $A_2^{(2)}$ generalized symmetries are found. For the systems $A_2$, $B_2$, $C_2$, $G_2$, $D_3$ complete sets of independent integrals are found. The Lax representation for the difference-difference systems corresponding to $A_N$, $B_N$, $C_N$, $A^{(1)}_1$, $D^{(2)}_N$ are presented.

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