Ludek Zajicek, Faculty of Mathematics and Physics, Charles University, Sokolovska 83, 186 00 Praha 8, Czech Republic, e-mail: zajicek@karlin.mff.cuni.cz
Abstract: Results of Jan Marik on the theory of derivatives of real functions are described.
Keywords: derivative, multiplier
Classification (MSC91): 01A70, 26A24
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