Encrypting Images Using the Sum of Functions of a Real Variable by Viktor V. Avramenko, Junzo Watada, Mykyta O. Bondarenko, Nataliya Kalashnykova, Mohd Hilmi Hasan

“…Its unique feature is the use of functions of a real variable as keys instead of natural numbers. …”
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Approximation of classes of Poisson integrals by Fejer means by O. Rovenska

“…The asymptotic behavior is considered for the functions represented by the Poisson integrals of periodic functions of a real variable. The mentioned classes consist of analytic functions of a real variable. …”
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Development of a numerical method for solving optimization problems approximation of the function given approximately and its derivatives based on the variational approach by Igor Naats, Victoria Igorevna Naats, Elena Yartseva

“…Introduction: the presented work continues the authors' research on the methods of the theory of approximation of functions of a real variable, given approximately, on the basis of their representation by integrals. …”
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