Publications

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In Press
Karlovych, Oleksiy, and Sandra Mary Thampi. "On multiplier analogues of the algebra C+H^\infty on weighted rearrangement-invariant sequence spaces." Journal of Approximation Theory (In Press).
Karlovych, Oleksiy, and Márcio Valente. "On the operator and essential norms of Fourier convolution operators and Wiener-Hopf operators with the same symbol." Proceedings of IWOTA 2023. Birkhäuser, In Press.
2025
Böttcher, Albrecht, Oleksiy Karlovych, Eugene Shargorodsky, and Ilya M. Spitkovsky(eds.) Achievements and Challenges in the Field of Convolution Operators. The Yuri Karlovich Anniversary Volume. Operator Theory: Advances and Applications, vol. 306. Cham: Birkhäuser, 2025.Website
Karlovych, Oleksiy, and Eugene Shargorodsky. "The essential norms of Toeplitz operators with symbols in $C+H^\infty$ on weighted Hardy spaces are independent of the weights." Integral Equations and Operator Theory. 97 (2025): article 4.Website
Karlovych, Oleksiy. "Fredholmness of pseudodifferential operators on rearrangement-invariant spaces." Pseudo-Differential Operators and Related Topics, Extended Abstracts PSORT 2024. Eds. Vishvesh Kumar, David Rottensteiner, and Michael Ruzhansky. Cham: Birkhäuser, 2025. 39-46.
Karlovych, Oleksiy, and Alina Shalukhina. "A necessary condition for the boundedness of the maximal operator on Lp(⋅) over reverse doubling spaces of homogeneous type." Analysis Mathematica. 51.1 (2025): 241-248.Website
Fernandes, Cláudio, and Oleksiy Karlovych. "On pseudodifferential operators with slowly oscillating symbols on variable Lebesgue spaces with Khvedelidze weights." Achievements and Challenges in the Field of Convolution Operators. The Yuri Karlovich Anniversary Volume. Operator Theory: Advances and Applications, vol. 306. Eds. Albrecht Böttcher, Oleksiy Karlovych, Eugene Shargorodsky, and Ilya Spitkovsky. Cham: Birkhäuser, 2025. 201-214.
Karlovych, Oleksiy, and Márcio Valente. "On the algebra of singular integral operators with almost periodic coefficients." Achievements and Challenges in the Field of Convolution Operators. The Yuri Karlovich Anniversary Volume. Operator Theory: Advances and Applications, vol. 306. Eds. Albrecht Böttcher, Oleksiy Karlovych, Eugene Shargorodsky, and Ilya Spitkovsky. Cham: Birkhäuser, 2025. 247-262.
Karlovych, Oleksiy, and Eugene Shargorodsky. "On the essential norms of Toeplitz operators on abstract Hardy spaces built upon Banach function spaces." Boletín de la Sociedad Matemática Mexicana. 31 (2025): 8.Website
Karlovych, Oleksiy, and Eugene Shargorodsky. "On the essential norms of Toeplitz operators with symbols in C+H-infinity acting on abstract Hardy spaces built upon translation-invariant Banach function spaces." Bulletin des Sciences Mathématiques. 201 (2025): 103599.Website
2024
Karlovych, Oleksiy, and Eugene Shargorodsky. "Bounded compact and dual compact approximation properties of Hardy spaces: new results and open problems." Indagationes Mathematicae. 35.1 (2024): 143-158.Website
Karlovych, Oleksiy, and Sandra Mary Theampi. "The Brown-Halmos theorem for discrete Wiener-Hopf operators." Advances in Operator Theory. 9 (2024): 69.Website
Karlovych, Oleksiy, and Eugene Shargorodsky. "Discrete Riesz transforms on rearrangement-invariant Banach sequence spaces and maximally noncompact operators." Pure and Applied Functional Analysis. 9.1 (2024): 195-210.okes12-pafa-2022-12-16.pdfWebsite
Karlovych, Oleksiy, and Alina Shalukhina. "Maximal noncompactness of singular integral operators on L2 spaces with some Khvedelidze weights." Operator and Matrix Theory, Function Spaces, and Applications, Proceedings of the International Workshop on Operator Theory and its Applications (IWOTA 2022). Operator Theory: Advances and Applications, vol. 295. 2024. 279-295.okas-2023-08-18.pdf
Karlovych, Oleksiy, and Alina Shalukhina. "Maximal noncompactness of singular integral operators on Lp spaces with power weights." Tbilisi Analysis and PDE Seminar. Extended Abstracts of the 2020-2023 Seminar Talks. Eds. Rolnad Duduchava, Eugene Shargorodsky, and George Tephnadze. Cham: Birkhäuser, 2024. 87-97.
Karlovych, Oleksiy, and Eugene Shargorodsky. "On dilations of Fourier multipliers on weighted Lebesgue spaces." Analysis Without Borders. Operator Theory: Advances and Applications, vol 297. Ed. Sergei Rogosin. Cham: Birkhäuser, 2024. 109-122.
Karlovych, Oleksiy, and Márcio Valente. "On the algebras of Wiener-Hopf operators with continuous symbols acting on some Banach function spaces." Analysis Without Borders. Operator Theory: Advances and Applications, vol 297. Ed. Sergei Rogosin. 2024. 123-144.
Curbera, Guillermo P., Oleksiy Karlovych, and Eugene Shargorodsky. "On the full range of Zippin and inclusion indices of rearrangement-invariant spaces." Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A. Matemáticas. 118 (2024): 93.Website
Karlovych, Oleksiy, and Eugene Shargorodsky. "A remark on piecewise linear interpolation of continuous Fourier multipliers." Tbilisi Analysis and PDE Seminar. Extended Abstracts of the 2020-2023 Seminar Talks. Eds. Rolnad Duduchava, Eugene Shargorodsky, and George Tephnadze. Cham: Birkhäuser, 2024. 99-107.
Karlovych, Oleksiy, and Eugene Shargorodsky. "A remark on Toeplitz and Laurent operators acting on l-p spaces with power weights." Linear Algebra and Applications. 697 (2024): 82-92.Website
2023
Diening, Lars, Oleksiy Karlovych, and Eugene Shargorodsky. "Addendum to "On interpolation of reflexive variable Lebesgue spaces on which the Hardy–Littlewood maximal operator is bounded"." Georgian Mathematical Journal . 30.2 (2023): 211-212.Website
Karlovych, Oleksiy, and Eugene Shargorodsky. "The Coburn lemma and the Hartman-Wintner-Simonenko theorem for Toeplitz operators on abstract Hardy spaces." Integral Equations and Operator Theory. 95 (2023): 6.Website
Karlovych, Oleksiy, and Eugene Shargorodsky. "On the interpolation constants for variable Lebesgue spaces." Mathematische Nachrichten. 296 (2023): 2877-2902.Website
Karlovych, Oleksiy, and Eugene Shargorodsky. "On the weak convergence of shift operators to zero on rearrangement-invariant spaces." Revista Matemática Complutense. 36.1 (2023): 91-124.Website
Karlovych, Oleksiy, and Eugene Shargorodsky. "Remark on singular integral operators of convolution type on rearrangement-invariant Banach function spaces." Real Analysis Exchange. 48.1 (2023): 139-148.Website