Under some assumptions on the matrix of a summability method, whose rows are sequences of bounded variation, we obtain a generalization and an improvement of some results of Xie-Hua Sun and L. Leindler.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-bc79-0-9, author = {W\l odzimierz \L enski and Bogdan Szal}, title = {On the approximation of functions by matrix means in the generalized H\"older metric}, journal = {Banach Center Publications}, volume = {83}, year = {2008}, pages = {119-129}, zbl = {1143.42003}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc79-0-9} }
Włodzimierz Łenski; Bogdan Szal. On the approximation of functions by matrix means in the generalized Hölder metric. Banach Center Publications, Tome 83 (2008) pp. 119-129. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc79-0-9/