Calibration of an ellipse's algebraic equation and direct determination of its parameters.

Said, Mohamed Ali

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On a generalization of the notion of a semi-group

Włodzimierz Waliszewski (1966)

Colloquium Mathematicae

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Bernstein's inequality on algebraic curves

Charles Fefferman, Raghavan Narasimhan (1993)

Annales de l'institut Fourier

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An example of a non-degenerate precession possessing two distinct pairs of axes

Giancarlo Cantarelli, Corrado Risito (2003)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

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In the present paper we provide an interesting example of a non-degenerate precession possessing two distinct pairs $(p, f)$ , $(p^{'}, f^{'})$ of axes of precession and figure. Thus the problem arises of the existence of classes of precessions possessing a unique axis of precession and a unique axis of figure. In the fourth section we show that the class of non-degenerate regular precessions enjoys this property.