Hsieh, Po-Fang Analytic simplification of a system of ordinary differential equations at an irregular type singularity. (English) Zbl 0258.34005 Comment. Math. Univ. St. Pauli 20, 55-82 (1971). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document MSC: 34M35 Singularities, monodromy and local behavior of solutions to ordinary differential equations in the complex domain, normal forms 34A25 Analytical theory of ordinary differential equations: series, transformations, transforms, operational calculus, etc. PDFBibTeX XMLCite \textit{P.-F. Hsieh}, Comment. Math. Univ. St. Pauli 20, 55--82 (1971; Zbl 0258.34005)