On types of degenerate elliptic operators
Sbornik. Mathematics, Tome 66 (1990) no. 2, pp. 523-540 Cet article a éte moissonné depuis la source Math-Net.Ru

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A general method for studying various classes of degenerate operators connected with Newton polyhedra is presented. This method extends the approach of Vishik and Grushin, permits the study of various classes of operators to be more easily reduced to a few model classes, and allows new classes to be studied. Bibliography: 11 titles.
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     author = {S. Z. Levendorskii},
     title = {On types of degenerate elliptic operators},
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     volume = {66},
     number = {2},
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     url = {http://geodesic.mathdoc.fr/item/SM_1990_66_2_a13/}
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S. Z. Levendorskii. On types of degenerate elliptic operators. Sbornik. Mathematics, Tome 66 (1990) no. 2, pp. 523-540. http://geodesic.mathdoc.fr/item/SM_1990_66_2_a13/

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[2] Vishik M. I., Grushin V. V., “Kraevye zadachi dlya ellipticheskikh uravnenii, vyrozhdayuschikhsya na granitse oblasti”, Matem. sb., 80(122) (1969), 455–491 | Zbl

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[8] Bagirov L. A., Myshkis P. A., “O razreshimosti odnogo klassa ellipticheskikh uravnenii, vyrozhdayuschikhsya na granitse oblasti”, Ann. Univ. Sci. Budapest, 27 (1985), 3–19 | MR

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