Mathematics – Classical Analysis and ODEs
Scientific paper
2009-06-16
Mathematics
Classical Analysis and ODEs
20 pages
Scientific paper
Let $(E)$ a homogeneous linear differential equation of order $n$ Fuchsien over $\mathbb{P}^{1}(\mathbb{C}) $. The idea of Riemann (1857) was to obtain the properties of solutions of (E) by studying the local system. Thus, he obtained some properties of Gauss hypergeometric functions by studying the assocated rank 2 local system over $\mathbb{P}^{1}(\mathbb{C}) \backslash {3 points} $. For example, he obtained the Kummer transformations of the hypergeometric functions without any calculation. The success of the Riemann's methods is due to the fact that the irreducible rank 2 local system over $\mathbb{P}^{1}(\mathbb{C}) \backslash {3 points} $ are "rigid". Levelt theorem, see \cite{B} Theorem 1.2.3 proves this result. In this work, we propose a partial generalization of this theorem.
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