Definitions of maximal differential operators. (English) Zbl 0131.09403

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[1] M. S. Birman, On the theory of general boundary problems for elliptic differential equations. Doklady Akad. Nauk SSSR (N. S.),92, 205–208 (1953). (Russian.)
[2] L. Hörmander, On the theory of general partial differential operators. Acta Math.94, 161–248 (1955). · Zbl 0067.32201 · doi:10.1007/BF02392492
[3] L. Hörmander, On the interior regularity of the solutions of partial differential equations. To appear in Comm. Pure Appl. Math.
[4] B. Malgrange, Sur une classe d’opérateurs différentiels hypoelliptiques. To appear in Bull. Soc. Math. France85, fasc. 3 (1957). · Zbl 0082.09303
[5] S. Schwarz, On weak and strong extensions of partial differential operators with constant coefficients. To appear in this journal. · Zbl 0131.09501
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