That circulation of F ( x , y ) = 〈 x 2 , y 2 , z ( x 2 + y 2 ) 〉 around any curve C on the surface of the cone z 2 = x 2 + y 2 is equal to zero.

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Chapter 17, Problem 28CRE

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That circulation of $F (x, y) = 〈 x^{2}, y^{2}, z (x^{2} + y^{2}) 〉$ around any curve C on the surface of the cone $z^{2} = x^{2} + y^{2}$ is equal to zero.

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