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arXiv 0706.4201math.RTmath-phmath.APmath.MPnlin.SI
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微分算子和发展偏微分方程的树图李代数

Tree Diagram Lie Algebras of Differential Operators and Evolution Partial Differential Equations

Xiaoping Xu

摘要:

树图是由有限维单李代数的Dynkin图推广而来的边权为正整数的树。我们引入了两个幂零李代数和它们的扩展的可解李代数,它们与每个树图相关联。可解树图李代数与有限维单李代数的Borel子代数类似,是具有最大秩的完备李代数.他们的阿贝尔理想是完全确定的。利用树图李代数的一个高阶Campbell-Hausdorff公式和交换理想,研究了与幂零树图李代数相关的一阶发展偏微分方程和高阶发展偏微分方程的初值问题,包括与树相关的广义Tricomi算子相关的热传导型方程.

英文摘要:

A tree diagram is a tree with positive integral weight on each edge, which is a notion generalized from the Dynkin diagrams of finite-dimensional simple Lie algebras. We introduce two nilpotent Lie algebras and their extended solvable Lie algebras associated with each tree diagram. The solvable tree diagram Lie algebras turn out to be complete Lie algebras of maximal rank analogous to the Borel subalgebras of finite-dimensional simple Lie algebras. Their abelian ideals are completely determined. Using a high-order Campbell-Hausdorff formula and certain abelian ideals of the tree diagram Lie algebras, we solve the initial value problem of first-order evolution partial differential equations associated with nilpotent tree diagram Lie algebras and high-order evolution partial differential equations, including heat conduction type equations related to generalized Tricomi operators associated with trees.

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