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A local constancy principle for the solutions of certain overdetermined systems of first-order linear partial differential equations. (English) Zbl 0475.35027

Adv. Math., Suppl. Stud. 7A, 245-262 (1981).

MSC:

35F05 Linear first-order PDEs
35A30 Geometric theory, characteristics, transformations in context of PDEs
32C05 Real-analytic manifolds, real-analytic spaces
65H10 Numerical computation of solutions to systems of equations