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Diagonalisation d’opérateurs non-autoadjoints et séparation des variables. (French) Zbl 0528.47029

Journ. Équ. Dériv. Partielles, Saint-Jean-De-Monts 1983, Exp. No. 17, 13 p. (1983).

MSC:

47D03 Groups and semigroups of linear operators
47E05 General theory of ordinary differential operators
47F05 General theory of partial differential operators
35J30 Higher-order elliptic equations