Geodesic
Discontinuous Steklov operators in the problem of uniform approximation of derivatives on an interval
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 54 (2014) no. 9, pp. 1442-1557
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With the help of discontinuous Steklov operators, families of integral operators are constructed, which are used to obtain uniform approximations to derivatives of an arbitrary order for a function given on an interval. 
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A. P. Khromov; G. V. Khromova. Discontinuous Steklov operators in the problem of uniform approximation of derivatives on an interval. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 54 (2014) no. 9, pp. 1442-1557. http://geodesic.mathdoc.fr/item/ZVMMF_2014_54_9_a1/

[1] Khromov A. P., Khromova G. V., “Ob odnoi modifikatsii operatora Steklova. Sovr. probl. teorii funktsii i ikh prilozheniya”, Tezisy dokl. Sarat. zimn. shk., Izd-vo Sarat. un-ta, Saratov, 2010, 181

[2] Khromov A. A., “O priblizhenii funktsii vmeste s ee proizvodnoi na otrezke. Sovr. probl. teorii funktsii i ikh prilozheniya”, Materialy 17-i mezhdun. Sarat. zimn. shk., Nauchnaya kniga, Saratov, 2014, 285–287

[3] Ivanov V. K., “Ob integralnykh uravneniyakh Fredgolma pervogo roda”, Differents. ur-niya, 3:3 (1967), 410–421

[4] Krechmar V. A., Zadachnik po algebre, Nauka, M., 1968