Lemma
MediumPartial derivatives
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.3 Tangent Planes and Linear Approximations, #20 · Multivariable Calculus · Partial derivatives

Resistances … and … have parallel resistance …, where

Resistances and have parallel resistance , where . Is more sensitive to or if and ?

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.3 Tangent Planes and Linear Approximations, #20

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