Ob Ogranichenosti Norm Trigonometricheskih Mnogochlenov I ih Primenenii k Metodam Summirovaniya Ryadov Fur'e
Miodrag Ivović (1981)
Publications de l'Institut Mathématique
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Miodrag Ivović (1981)
Publications de l'Institut Mathématique
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Aleksandar Tomić (1976)
Publications of Department of Astronomy
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Lu, Youmin, Shao, Zhoude (2004)
International Journal of Mathematics and Mathematical Sciences
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Lažetić, Nebojša L. (1985)
Publications de l'Institut Mathématique. Nouvelle Série
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Hsiang, Fu Cheng (1967)
Portugaliae mathematica
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Javier Chavarriga (1994)
Applicationes Mathematicae
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We study integrability of two-dimensional autonomous systems in the plane with center type linear part. For quadratic and homogeneous cubic systems we give a simple characterization for integrable cases, and we find explicitly all first integrals for these cases. Finally, two large integrable system classes are determined in the most general nonhomogeneous cases.
Gregorac, R.J. (1989)
International Journal of Mathematics and Mathematical Sciences
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Nicola Garofalo, Zhongwei Shen (1994)
Annales de l'institut Fourier
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We establish a Carleman type inequality for the subelliptic operator in , , where , . As a consequence, we show that has the strong unique continuation property at points of the degeneracy manifold if the potential is locally in certain spaces.
Alois Švec (1978)
Časopis pro pěstování matematiky
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