Vengono stabiliti criteri di non oscillazione per equazioni a derivate parziali ellittiche d'ordine pari.
@article{RLINA_1975_8_59_1-2_57_0, author = {E. S. Noussair and N. Yoshida}, title = {Nonoscillation Criteria for Elliptic Equations of Order 2 m}, journal = {Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti}, volume = {59}, year = {1975}, pages = {57-64}, zbl = {0347.35007}, language = {en}, url = {http://dml.mathdoc.fr/item/RLINA_1975_8_59_1-2_57_0} }
Noussair, E. S.; Yoshida, N. Nonoscillation Criteria for Elliptic Equations of Order 2 m. Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti, Tome 59 (1975) pp. 57-64. http://gdmltest.u-ga.fr/item/RLINA_1975_8_59_1-2_57_0/
[1] Comparison theorems for eigenvalues, «Ann. Mat. Pura Appl.», 99, 81-107. | MR 348294 | Zbl 0278.35070
and (1974) -[2] | MR 190800 | Zbl 0143.36505
(1965) - Direct Methods of Qualitative Spectral Analysis of Singular Differential Operators, Davey, New York.[3] Some oscillation properties of selfadjoint elliptic equations, «Proc. Amer. Math. Soc.», 25, 824-829. | MR 259323 | Zbl 0197.37201
(1970) -[4] Oscillation criteria for elliptic equations, «Pacific J. Math.», 27, 501-506. | MR 236502 | Zbl 0165.44304
and (1968) -[5] A Picone identity for strongly elliptic systems, «Duke Math. J.», 38, 473-481. | MR 280844 | Zbl 0221.35026
(1971) -[6] Sturm's theorem and oscillation of solutions of strongly elliptic systems, «Soviet Math. Dokl.», 3, 24-27. | MR 142874 | Zbl 0116.30003
(1962) -[7] Nonoscillation criteria for strongly elliptic systems, «Boll. Un. Mat. Ital.» (to appear). | MR 397123 | Zbl 0304.35039
and -[8] Comparison and nonoscillation theorems for fourth order elliptic systems, «Atti Accad. Naz. Lincei, Rend. Cl. Sci, Fis. Mat. Natur.» (to appear). | MR 425319 | Zbl 0335.35007
and -[9] Oscillation theory of elliptic equations of order 2 m, «J. Differential Equations», 10, 100-111. | MR 280845
(1971) -[10] Comparison and oscillation theorems for matrix differential inequalities, «Trans. Amer. Math. Soc.», 160, 203-215. | MR 280846 | Zbl 0246.35038
(1971) -[11] Nonoscillatory elliptic equations, «J. Differential Equations», 15, 541-550. | MR 342829 | Zbl 0289.35026
(1974) -[12] V. Ya. SKOROBOGAT'KO (1955) - On domains of solvability of Dirichlet's problem for self-adjoint elliptic equations, «Ukrain. Mat. Ž.», 7, 91-95 (Russian). | MR 72351
[13] Nonoscillation criteria for elliptic equations, «Canad. Math. Bull.», 12, 275-280. | MR 255961 | Zbl 0179.43103
(1969) -[14] Nonoscillation of elliptic differential equations of second order, «Hiroshima Math. J.», 4, 279-284. | MR 348245 | Zbl 0299.35029
(1974) -[15] Nonoscillation criteria for fourth order elliptic equations, «Hiroshima Math. J.», 5, 23-31. | MR 387788 | Zbl 0305.35005
(1975) -