On Baica's trigonometric identity.
Gregorac, R.J. (1989)
International Journal of Mathematics and Mathematical Sciences
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Gregorac, R.J. (1989)
International Journal of Mathematics and Mathematical Sciences
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Baica, Malvina (1986)
International Journal of Mathematics and Mathematical Sciences
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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.
Hu, Nu-Chun (2009)
JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
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Masala, G. (1999)
Rendiconti del Seminario Matematico
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Ren, Hongshan, Li, Hongyan (2002)
Applied Mathematics E-Notes [electronic only]
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Alois Švec (1978)
Časopis pro pěstování matematiky
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H. Fath el Bab (1977)
Czechoslovak Mathematical Journal
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