Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
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Librería Elías (Asturias)
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Librería Kolima (Madrid)
Librería Proteo (Málaga)
Consider a linear partial differential operator A that maps a vector-valued function Y = (Yl,'' Ym) into a vector-valued function I = (h,···, II). We assume at first that all the functions, as well as the coefficients of the differen tial operator, are defined in an open domain Jl in the n-dimensional Euclidean n space IR , and that they are smooth (infinitely differentiable). A is called an overdetermined operator if there is a non-zero differential operator A’ such that the composition A’ A is the zero operator (and underdetermined if there is a non-zero operator A' such that AA' = 0). If A is overdetermined, then A’I = 0 is a necessary condition for the solvability of the system Ay = I with an unknown vector-valued function y. 3 A simple example in 1R is the operator grad, which maps a scalar func tion Y into the vector-valued function (8y/8x!, 8y/8x2, 8y/8x3)’ A necessary solvability condition for the system grad y = I has the form curl I = O.
