# Difference between revisions of "Calculus:Error log"

product rule for partial differentiation directional derivative instead of gradient at one place, and a bunch of minor typos, missing open parenthesis, use of $\cdot$ for function product at one place (might confuse with dot product), and extraneous statements like "let $\overline{u}$ be a unit vector" in definition components where no unit vector was needed. April 2, 2012 didn't revisit page often enough