Lemma
MediumPartial derivatives
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.1 Surfaces and Level Curves, #14 · Multivariable Calculus · Partial derivatives

Find a function for which … has infinitely many pieces

Find a function for which has infinitely many pieces.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.1 Surfaces and Level Curves, #14

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