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Determining factors and hypoellipticity of ordinary differential operators with double ”characteristics”. (English) Zbl 0272.34006

Astérisque 2/3, 197-216 (1973).
For the entire collection see [Zbl 1384.35003].

MSC:

34E05 Asymptotic expansions of solutions to ordinary differential equations
47E05 General theory of ordinary differential operators
65H10 Numerical computation of solutions to systems of equations
34A25 Analytical theory of ordinary differential equations: series, transformations, transforms, operational calculus, etc.
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