Average circulation Let S be a small circular disk of radius R centered at the point P with a unit normal vector n. Let C be the boundary of S.
a. Express the average circulation of the vector field F on S as a surface
b. Argue that for small R, the average circulation approaches (▿ × F)|p·n (the component of ▿ × F in the direction of n evaluated at P) with the approximation improving as R→0.
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