Klesov, Oleg I.Steinebach, Josef G.2020-06-102020-06-102018Klesov, O. I. Some comments on the paper “O jednom O-inverznom stavu” by Vojislav G. Avakumović / O. I. Klesov, J. G. Steinebach // Mathematics in Modern Technical University. – 2018. – Vol. 2018, No 1. – P. 5–10.https://ela.kpi.ua/handle/123456789/34088Some comments concerning the origin of the (R–O) notion for real functions are given, which has been used in the paper above, but was first introduced by Avakumović (1935). Moreover, some later extensions and generalizations of such functions are briefly discussed.enregularly varying functionsORV-functionsnon-degenerate group of regular pointspreserving the asymptotic equivalenceправильно змінні функціїORV-функціїневироджена група регулярних точокзбереження асимптотичної еквівалентностіMSC2010: 26-03, 26A12, 26A48, 01A60, 01A61ArticlePp. 5-10https://doi.org/10.20535/mmtu-2018.1-005517.51