Geodesic
Spectral synthesis in a complex domain for a differential operator with constant coefficients. II. The module method
Sbornik. Mathematics, Tome 75 (1993) no. 1, pp. 1-15 
I. F. Krasichkov-Ternovskii. Spectral synthesis in a complex domain for a differential operator with constant coefficients. II. The module method. Sbornik. Mathematics, Tome 75 (1993) no. 1, pp. 1-15. http://geodesic.mathdoc.fr/item/SM_1993_75_1_a0/
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The problem of spectral synthesis for a subspace $W$ invariant with respect to a differential operator with constant coefficients was reduced earlier to verification that its annihilator submodule $I=\operatorname{An}W$ is ample. In the present article the property of ampleness is split into two parts – stability, and the property of being saturated. The latter properties are subjected to a systematic investigation.

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