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From the preface: ”Using strongly asymptotic expansions of functions of several (complex) variables, we prove existence theorems of asymptotic solutions to integrable systems of partial differential equations of the first order with irregular singular points under certain general conditions. We also prove analytic splitting lemmas for completely integrable linear Pfaffian systems. Moreover, for integrable connections with irregular singular points, we formulate and solve the Riemann- Hilbert-Birkhoff problem, and prove analogues of Poincaré’s lemma and de Rham cohomology theorem under certain general conditions.”

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