### On the order of natural differential operators and liftings

Andrzej Zajtz (1988)

Annales Polonici Mathematici

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Andrzej Zajtz (1988)

Annales Polonici Mathematici

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Piero d'Ancona (1992)

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze

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J. Ligęza (1977)

Annales Polonici Mathematici

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Plamen Djakov, Boris Mityagin (2012)

Bulletin of the Polish Academy of Sciences. Mathematics

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Stanisław Sędziwy (1972)

Annales Polonici Mathematici

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G. J. Butler (1974)

Annales Polonici Mathematici

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Beatriz Margolis (1972)

Annales Polonici Mathematici

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Galakhov, E. (1997)

Memoirs on Differential Equations and Mathematical Physics

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Ryotaro Sato (1976)

Colloquium Mathematicae

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Ryotaro Sato (1976)

Colloquium Mathematicae

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Tatiana Suslina (2000)

Journées équations aux dérivées partielles

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The lecture is devoted to the problem of absolute continuity of the spectrum of periodic operators. A general approach to this problem was suggested by L. Thomas in 1973 for the case of the Schrödinger operator with periodic electric potential. Further application of his method to concrete operators of mathematical physics met analytic difficulties. In recent years several new problems in this area have been solved. We propose a survey of known results in this area, including very recent,...

G. J. Butler, H. I. Freedman (1979)

Annales Polonici Mathematici

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S.C. Arora, Ramesh Kumar (1981)

Publications de l'Institut Mathématique

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