Relations between moduli of smoothness of the derivatives of a function and those of the function itself are investigated. The results are for and for 0 < p < ∞ using the moduli of smoothness and respectively.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-sm180-2-4, author = {Z. Ditzian and S. Tikhonov}, title = {Moduli of smoothness of functions and their derivatives}, journal = {Studia Mathematica}, volume = {178}, year = {2007}, pages = {143-160}, zbl = {1141.26005}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-sm180-2-4} }
Z. Ditzian; S. Tikhonov. Moduli of smoothness of functions and their derivatives. Studia Mathematica, Tome 178 (2007) pp. 143-160. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-sm180-2-4/