RT Journal Article SR Electronic A1 Marcel, ABAS T1 A NOTE ABOUT THE NORM OF GRADIENT JF Trends in education YR 2011 VO 4 IS 1 SP 13 OP 15 UL https://tvv-journal.upol.cz/en/artkey/tvv-201101-0003.php AB If the gradient of a function is non-zero in a point, it can be interpreted as the direction in which the function changes most quickly. In this contribution we show that there is a possibility to establish the direction even if the gradient is zero and that this can be done with knowledge which students have it their stage of study.