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Differential operators of principal type. (English) Zbl 0090.08101

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References:
[1] Bourbaki, N.: Espaces vectoriels topologiques. Chap. III?V. Paris 1955. · Zbl 0066.35301
[2] Friedrichs, K. O.: On the differentiability of the solutions of linear elliptic differential equations. Comm. Pure Appl. Math.6, 299-326 (1953). · Zbl 0051.32703
[3] Hörmander, L.: On the theory of general partial differential operators. Acta Math.94, 161-248 (1955). · Zbl 0067.32201
[4] Hörmander, L.: On interior regularity of the solutions of partial differential equations. Comm. Pure Appl. Math.11, 197-218 (1958). · Zbl 0081.31501
[5] Lewy, H.: An example of a smooth linear partial differential equation without solution. Ann. Math. (2)66, 155-158 (1957). · Zbl 0078.08104
[6] Schwartz, L.: Théorie des distributions I?II. Paris 1950-51. · Zbl 0037.07301
[7] Trèves, F.: Thèse d’Hörmander II. Séminaire Bourbaki 135 (Mai 1956), 2e éd. · Zbl 0145.13504
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