Probl. Anal. Issues Anal., 2021, Volume 10(28), Issue 1

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2021, Volume 10(28), Issue 1

	Several new integral inequalities via $k$-Riemann–Liouville fractional integrals operators S. I. Butt, B. Bayraktar, M. Umar		3
	Estimates for Sobolev-orthonormal functions and generated by Laguerre functions R. M. Gadzhimirzaev		23
	On the difference equation associated with the doubly periodic group and its applications F. N. Garif'yanov, E. V. Strezhneva		38
	Generating functions of the product of $2$-orthogonal Chebyshev polynomials with some numbers and the other Chebyshev polynomials H. Merzouk, B. Aloui, A. Boussayoud		52
	Harmonic mappings with the fixed analytic part Rajbala, Jugal K. Prajapat		69
	Modified modulus of smoothness and approximation in weighted Lorentz spaces by Borel and Euler means S. S. Volosivets		87
	Riemann boundary-value problem on Cassini spirals L. Zhixin, B. A. Kats		101