Linear differential equations and functions spaces by Jose Luis Massera, Juan F. Schaffer
By Jose Luis Massera, Juan F. Schaffer
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Sample text
E - T(Y +~) -iT"" + I ~'1 rl") f(. t))df[ . 2. 8) U,J pu. t TUIN )(y', A') ~ J ,-,\-,, - 1'1' f(t', U)dt' . 9) when: n" = n _ n' and H ()"' ) i$ a co ntintuH" /unction, equivalent goeJ to +00. Proof. 6). IN ") e- f(~"+t·d - ~ dy" ds . >. S2 which is not in the right hand side of t he fir st inclusion (tf" o; T~, TIr) If/. WF( tI) for every T" (to,T"iT~,O) If/. WF~ \u) fOl' every ERn" T" E R"" with Ir"l = 1. 12) T"A T' A (t ' , T"·, t" " _"0) -+ (t". , 1] T"·,'1 ~ t'~ " _-I ]r Z T" ' ) for every T'] > 0, T'2 > 0).
Second mic rolocalization since A is positive ddinite. Then T L n (iTL) = dimension n. h is totally real an u if Xo E L, there is a holomorphic change of coordinates in a neighborhood of Xo such that L is transformed into the su bmanifold Imx = O. r and Xo = 0, one just has to take the diffeomorphism Re x + i [m x -+ M Re x + iM [m x where 111 is a linear isomorphism from Illn over L. [n general, we may thus assume that ToL = R n and so that there is a real analytic fUllcti on h in a neighbor hood of 0 in an, satisfying h(O) =.
The assump tions we do below may seem quite complicated and technical. We make them because they will appear to be the natural hypothesis in the applications we will treat in Chapter IV. Let us first introduce the geometric data. We assume given: - Z a closed real analytic suhmanifold of R", - Ej, j = 1, ... , k, k real analytic hypersurfaces in Z x ]0, 1], which are subanalytic , _ ]0, 1], in Z x [0I], and transverse to th e fibres of the second projection Z x ]0 I] - E a real analytic submallifold of Z x JO, ],I su banalytic in Z x 0,[ I], transverse to the 6bres of the second projection Z x ]0,I] _ ]0, I].