Lemma
EasyGreen, Stokes & divergence
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §15.5 The Divergence Theorem, #3 · Multivariable Calculus · Green, Stokes & divergence

…: unit sphere

Compute the flux by the Divergence Theorem.

: unit sphere

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §15.5 The Divergence Theorem, #3

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