Calculus:Error log

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Did you find something that looks like an error (or possible error) to you? Report the error quickly here (anonymous, does not require login, but you can optionally provide an email ID to be notified of the fix).

We have just started logging errors. On this page, you will find information about all errors that persisted on the site for more than one month on any page. Note: This applies only to errors that were not fixed by December 18, 2011. Errors fixed before then are not being logged on this page.

Page Error description Version where it was introduced Version where it was corrected Why error? Why not caught? ("I" refers to Vipul)
first derivative test had "right" in place of "left" for one of the case rows September 19, 2011 April 24, 2012 didn't review, revisit page
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
partial derivative Had "x" in place of "y" in one of the derivative descriptions/definitions. December 17, 2011 April 1, 2012 Didn't revisit page often enough