Lemma
DeepChange of variables
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §14.2 Change to Better Coordinates, #39 · Multivariable Calculus · Change of variables

Find the … coordinates of the top point in Figure 14.6a and…

Find the coordinates of the top point in Figure 14.6a and check that it goes to .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §14.2 Change to Better Coordinates, #39

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