Malgrange, Bernard Sur les points singuliers des équations différentielles. (French) Zbl 0252.34031 Sémin. Goulaouic-Schwartz 1971-1972, Équat. dériv. part. anal. fonct., Exp. No. XX, 13 p. (1972). In this paper the author defines a measure of irregularity of singular points for an ordinary linear operator with holomorphic coefficients and studies its elementary properties. Reviewer: Bogdan Nowak (Łódź) Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 ReviewsCited in 3 Documents MSC: 34C05 Topological structure of integral curves, singular points, limit cycles of ordinary differential equations 34A25 Analytical theory of ordinary differential equations: series, transformations, transforms, operational calculus, etc. 34A12 Initial value problems, existence, uniqueness, continuous dependence and continuation of solutions to ordinary differential equations 34G99 Differential equations in abstract spaces Keywords:singular points; measure of irregularity; ordinary linear operator; holomorphic coefficients Citations:Zbl 0235.00002; Zbl 0252.34032; Zbl 0252.34033 × Cite Format Result Cite Review PDF Full Text: Numdam EuDML