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then and (both of which are defined on the interval ) are the two functions that determine . Then, by Fubini's theorem:
:.

-axis

If is normal with respect to the -axis and is a continuous function; then and (both of which are defined on the interval ) are the two functions that determine . Again, by Fubini's theorem:

:.

Normal domains on

If is a domain that is normal with respect to the -plane and determined by the functions and , then

:.

This definition is the same for

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