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MULTIPERIODIC SOLUTIONS OF SECOND-ORDER SYSTEMS WITH DIFFERENTIATION OPERATOR ON THE LYAPUNOV'S VECTOR FIELD

THE MAIN HAMILTON FUNCTION AND THE NECESSARY CONDITIONS FOR THE EXISTENCE OF A SITUATION IN THE FORM OF THE HAMILTON-JACOBI EQUATIONS

SOLVING SYSTEMS OF SECOND-ORDER DIFFERENTIAL EQUATIONS FOR SOME MULTIDIMENSIONAL HYPERGEOMETRIC FUNCTIONS

APPLICATION OF THE METHOD OF LIBERATION FROM CONNECTIONS TO PARTICULAR STATEMENTS OF PROBLEMS