> I hope, somebody finds it useful in her/his courses.

Well, for one, I'll be using this in class in an hour.   The students
were doing two-variable differentials for homework over the weekend.
Great timing.  ;-)  Thanks, Robert!

Jason Grout has built some nice sagelets for multivariate calculus for
the directional derivative and for max/min/saddle-points.  I've got
one going for high-degree two-variable Taylor polynomial
approximation.

Consider adding a screenshot and your code to the Interact/Calculus
section of the Sage wiki.  Jason or myself will eventually split off a
multivariate section and then add in more of our own sagelets.

Harald's adjusted link worked fine for me once I downloaded the
worksheet off sagenb and uploaded into my local store.

Rob



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