Bifurcation of an invariant torus of a system of differential equations in the degenerate case.
Usachev, Yu.V. (2001)
Sibirskij Matematicheskij Zhurnal
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Usachev, Yu.V. (2001)
Sibirskij Matematicheskij Zhurnal
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Ivanchov, N.I., Pabyrivska, N.V. (2002)
Sibirskij Matematicheskij Zhurnal
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Lavrent'ev , M.M., Spigler, R., Akhmetov, D.R. (2001)
Sibirskij Matematicheskij Zhurnal
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Marco Riccardi (2009)
Formalized Mathematics
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In this article, the principal n-th root of a complex number is defined, the Vieta's formulas for polynomial equations of degree 2, 3 and 4 are formalized. The solution of quadratic equations, the Cardan's solution of cubic equations and the Descartes-Euler solution of quartic equations in terms of their complex coefficients are also presented [5].
Pukhnachev, V.V. (2002)
Sibirskij Matematicheskij Zhurnal
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Rudykh, G.A., Semenev, Eh.I. (2001)
Siberian Mathematical Journal
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Borovkov, A.A. (2000)
Siberian Mathematical Journal
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Kuznetsov, D.S. (2002)
Sibirskij Matematicheskij Zhurnal
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Borovkov, A.A. (2002)
Sibirskij Matematicheskij Zhurnal
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Begmatov, A.Kh. (2000)
Siberian Mathematical Journal
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Bruce C. Berndt, Heng Huat Chan, Liang-Cheng Zhang (1998)
Acta Arithmetica
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Khusnutdinova, N.V. (2001)
Sibirskij Matematicheskij Zhurnal
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Bouziani, Abdelfatah, Merazga, Nabil (2006)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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