Green’s Theorem - Examples I

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Welcome to my video series on Vector Calculus. You can access the full playlist here:

Videos by Zack Cramer, University of Waterloo. Textbook reference: Essential Calculus by James Stewart
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I don't understand the Jacobian for this transformation being -1/2, As I understood it the Jacobian matrix is | (partial x WRT u) followed by (partial x WRT v) on top and (partial y WRT u) followed by (partial y WRT v) | on the bottom, basically the inverse of what is written at 8:11. I was so confused about the inverting strategy that I ran the calculation the way I learned it and ended up with J = -2. I went and watched some other Jacobian videos that show the same process I learned, and put the equations U=x+y and V=x-y into an online Jacobian calculator all resulting in J = -2. The calculation still results an answer of zero for the double integral. Can you provide any more clarity on doing the Jacobian in the manner you describe because I can't seem to make it check out in this instance.

jacobmaguire