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arXiv 2008.10872math.AGcs.SC
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非对易Picard-Vessiot理论

Towards a noncommutative Picard-Vessiot theory

G. Duchamp, Viincel Hoang Ngoc Minh, Vu Nguyen Dinh, Pierre Simonnet

摘要:

一个关于$m$微分形式的Chen生成级数,是一个关于$m$字母的非交换级数,其系数是单连通流形上的全纯函数,即一个变(全纯)系数级数,它满足一阶非交换微分方程,有些作者把它看作是泛微分方程,(即)普遍性可以通过用常数矩阵替换每个字母(分别为:解析向量场),然后求解线性系统(分别为非线性)微分方程.通过有理级数,在非交换不定式和系数在环上,以及它们的非平凡组合霍普夫代数上,我们给出了非交换Picard-Vessiot理论的第一步,并通过前面提到的泛方程,用具有奇异正则奇异性的线性微分方程的情况来说明它。

英文摘要:

A Chen generating series, along a path and with respect to $m$ differential forms,is a noncommutative series on $m$ letters and with coefficients which are holomorphic functionsover a simply connected manifold in other words a series with variable (holomorphic) coefficients.Such a series satisfies a first order noncommutative differential equation which is considered, bysome authors, as the universal differential equation, (i.e.) universality can beseen by replacing each letter by constant matrices (resp. analytic vector fields)and then solving a system of linear (resp. nonlinear) differential equations.Via rational series, on noncommutative indeterminates and with coefficients in rings, andtheir non-trivial combinatorial Hopf algebras, we give the first step of a noncommutativePicard-Vessiot theory and we illustrate it with the case of linear differential equationswith singular regular singularities thanks to the universal equation previously mentioned.

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