scientific article; zbMATH DE number 1223487
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Publication:4218788
zbMath0921.47032MaRDI QIDQ4218788
Publication date: 30 September 1999
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General spectral theory of ordinary differential operators (34L05) Linear symmetric and selfadjoint operators (unbounded) (47B25) General theory of ordinary differential operators (47E05) Spaces with indefinite inner product (Kre?n spaces, Pontryagin spaces, etc.) (46C20) Linear operators on spaces with an indefinite metric (47B50)
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