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Browsing by Author "Calin, Iurie"

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THE GL(2;R)-INVARIANT CENTER CONDITIONS FOR THE CUBIC DIFFERENTIAL SYSTEMS WITH DEGENERATE INFINITY

Calin, Iurie; Baltag, Valeriu (Valines SRL, 2014)

In this paper the GL(2;R)-invariant center conditions for the origin of the coordinates of the phase plane of the cubic differential systems with degenerate infinity were established.
THE LYAPUNOV QUANTITIES AND THE GL(2,R)-INVARIANT CENTER CONDITIONS FOR A CLASS OF BIDIMENSIONAL POLYNOMIAL SYSTEMS OF DIFFERENTIAL EQUATIONS WITH NONLINEARITIES OF THE FOURTH DEGREE

Ciubotaru, Stanislav; Calin, Iurie (CEP USM, 2017)

For the bidimensional polynomial systems of differential equations with nonlinearities of the fourth degree the recurent equations for determination of the Lyapunov quantities were established. Moreover, the general form ...
METODE CANTITATIVE ÎN LUAREA DECIZIILOR: SUPORT DE CURS

Platon, Valeriu; Calin, Iurie (CEP USM, 2021)

Conținutul lucrării ține de cercetări operaționale – știința despre alegerea rațională, științific argumentată a deciziilor in diferite domenii de activitate. Accentul se pune pe utilizarea diverselor tehnici ...
THE RATIONAL BASES OF GL(2;R)-COMITANTS AND OF INVARIANTS FOR THE BIDIMENSIONAL SYSTEM OF DIFFERENTIAL EQUATIONS WITH NONLINEARITIES OF THE FOURTH DEGREE

Calin, Iurie; Ciubotaru, Stanislav (Valines SRL, 2014)

In this paper minimal rational bases of GL(2;R)-comitants and a rational basis of GL(2;R)-invariants for the bidimensional system of differential equations with nonlinearities of the fourth degree are presented.

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