date topic
19 Sep Geogebra file for problem 2, page 751
219 Sep Level curves and limits
33 Oct Tangent planes and linearization
417 Oct Double integrals
523 Oct Maple file for problem 16, page 883
631 Oct Geogebra file for problem 6, page 912
714 Nov Vector fields
814 Nov Reversed orientation of a parametric curve
921 Nov Div, Grad, Curl, and all that