Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.1 Surfaces and Level Curves, #12 · Multivariable Calculus · Partial derivatives

Construct a function whose level curve … is in two separate pieces

Construct a function whose level curve $f = 0$ is in two separate pieces.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.1 Surfaces and Level Curves, #12

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