Search Results - "Grigorian, G A"

New reducibility criteria for systems of two linear first-order ordinary differential equations by Grigorian, G. A.

“…Some new global solvability criteria for scalar Riccati equations are proved. On the basis of these criteria and a work of Erougin some new reducibility…”
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On the reducibility systems of two linear first-order ordinary differential equations by Grigorian, G. A.

“…Some global solvability criteria for the scalar Riccati equations are used to establish new reducibility criteria for systems of two linear first-order…”
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On the reducibility of systems of two linear first-order ordinary differential equations by Grigorian, G. A.

“…Some global solvability criteria for the scalar Riccati equations are used to establish new reducibility criteria for systems of two linear first-order…”
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Oscillation and non-oscillation criteria for linear nonhomogeneous systems of two first-order ordinary differential equations by Grigorian, G.A.

“…The Riccati equation method is used to establish oscillation and non-oscillation criteria for nonhomogeneous linear systems of two first-order ordinary…”
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Local geomagnetic field variations of external origin: A case study of Armenia by Grigorian, A G

“…A method is proposed for studying variations in the local geomagnetic field of external origin that are associated with variations in the electrical…”
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On the reducibility of systems of two linear first-order ordinary differential equations by Grigorian, G. A.

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Global solvability criteria for quaternionic Riccati equations by Grigorian, G.A.

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Endovenous laser obliteration and combined phlebectomy for treatment of varicose veins in elderly and senile patients by Shaĭdakov, E V, Khavinson, V Kh, Bulatov, V L, Son'kin, I N, Rosukhovskiĭ, D A, Iliukhin, E A, Grigorian, A G, Tsarev, O I

“…In the available literature, we have found no comparative data on the efficiency and safety of endovenous laser ablation (EVLA) and traditional phlebectomy in…”
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OSCILLATORY CRITERIA FOR THE SYSTEMS OF TWO FIRST-ORDER LINEAR DIFFERENTIAL EQUATIONS by GRIGORIAN, G.A.

“…A definition of strict oscillation of the system of two first-order linear ordinary differential equations is given. It is shown that oscillation follows from…”
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SOME PROPERTIES OF THE SOLUTIONS OF THIRD ORDER LINEAR ORDINARY DIFFERENTIAL EQUATIONS by GRIGORIAN, G.A.

“…The method of Riccati equations is used to study some properties of third order linear ordinary differential equations. Some criteria of asymptotic behavior…”
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Oscillation criteria for extended linear matrix Hamiltonian systems by Grigorian, G. A

“…The Riccati equation method is used to establish new oscillation criteria for extended linear matrix Hamiltonian systems. This method allows to obtain results…”
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A non oscillation criterion for extended quasi linear Hamiltonian systems by Grigorian, G. A

“…A new approach with the Riccati equation method is used to obtain a non oscillation criterion for extended quasi linear Hamiltonian systems…”
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An analysis of hospital mortality of casualties with combined cerebro-cranial traumas in St. Petersburg and problems of the quality of medical care by Shchedrenok, V V, Moguchaia, O V, Iakovenko, I V, Grigorian, G A, Anikeev, N V, Fedorov, A V, Popov, Iu V, Ianina, N A

“…Clinico-statistical characterization of 661 subjects who died from combined cerebro-cranial traumas in hospitals of St. Petersburg in 2004 is presented with an…”
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Comparison criteria for first order polynomial differential equations by Grigorian, G. A

“…In this paper we use the comparison method for investigation of first order polynomial differential equations. We prove two comparison criteria for these…”
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Solvability conditions for a class of Wiener-Hopf integral equations of 1-st kind by Grigorian, G. A

“…The Wiener-Hopf integral equations of 1-st kind relates to the class of Wiener-Hopf equations of non normal type, to which the classical Wiener-Hopf method is…”
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Comparison criterion for second order Riccati equations by Grigorian, G. A

“…Three comparison criteria are obtained for second order Riccati equations. On the basis of these criteria some global existence theorems are proved mentioned…”
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A generalization of the Gronwall-Bellman lemma by Grigorian, G. A

“…The Riccati equation method is used to obtain a generalization of the Gronvall-Bellman lemma the obtained result is used to generalize a result of Lyapunov…”
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On the localization of roots of polynomials by Grigorian, G. A

“…In this article we use a method of finding the index of a complex-valued function by determined number of arithmetic operations to describe an algorithm of…”
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Comparison criteria for the Abel equation of 1st kind by Grigorian, G. A

“…Three comparison criteria for the Abel equation of 1es kind are proved. The results obtained are used to obtain global solvability criteria and some criteria…”
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Kamenev type conditions for oscillation of third order linear ordinary differential equations by Grigorian, G. A

“…The Riccati equation method is used to establish Kamenev type conditions for the existence of oscillatory solutions to third order linear ordinary differential…”
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