On the analytic validity of formal simplifications of linear differential equations. I

MR0212305 Wasow, Wolfgang Wolfgang WASOW On the analytic validity of formal simplifications of linear differential equations. I Funkcialaj Ekvacioj. Serio Internacia 9 1966 83--91 http://fe.math.kobe-u.ac.jp/FE/Free/vol09/fe09-15.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE01-10-en_KML/fe09-083-091/fe09-083-091.pdf http://www.ams.org/mathscinet-getitem?mr=MR0212305 fe09-083-091 1966 On the Analytic Validity of Formal Simplifications of Linear Differential Equations, I WASOW, Wolfgang WASOW, Wolfgang 1 Hanson, R. J., Reduction theorems for systems of ordinary differential equations with a turning point, To be published in Jour. Math. Anal. and Applications (1966) MR0201748 2 Iwano, M. Asymptotic solutions of a system of linear ordinary differential equations containing a small parameter, I Funkcialaj Ekvacioj 5 1963 71-134 MR0171045 0171045 100 Cache/Iw/Iwano,Asymptotic,Funkcialaj*,1963,1964

3 Iwano, M.; Sibuya, Y. Reduction of the order of a linear ordinary differential equation containing a small parameter Kodai Math. Seminar Reports 15 1963 1-28 MR0149034 Cache/Iw/Iwano,Reduction,K\=odai*,1963,1964

4 Sibuya, Y. Asymptotic solutions of a system of linear ordinary differential equations containing a parameter Funkcialaj Ekvaciaj 4 1962 83-113 MR0141853 0141853 100 Cache/Si/Sibuya,Asymptotic,Funkcialaj*,1962,1963

5 Wasow, W. Turning point problems for systems of line ar equations, I. The formal theory Comm. Pure Appl. Math. 14 1961 657-673 MR0132248 84 Cache/Wa/Wasow,equations,,Comm*,1961,1962

6 Wasow, W. Turning point problems for systems of line ar equations, II. The analytic theory Comm. Pure Appl. Math. 15 1962 173-187 MR0146466 84 Cache/Wa/Wasow,equations,II,Comm*,1962,1963

7 Wasow, W. Simplification of turning point problems for systems of linear differential equations Trans. Am. Math. Soc. 106 1963 100-114 MR0142836 100 Cache/Wa/Wasow,Simplification,Trans*,1963,1964

8 Wasow, W. Asymptotic Expansions for Ordinary Differential Equations Interscience (Wiley) New York 1965 362 MR0203188 Cache/Wa/Wasow,Asymptotic,Interscience*,1965,1966