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Addition Property
ADDITION PROPERTY Let D be divided into two regions D1 and D2 which meet only on a common boundary as in Figure 12.1.13. Then
Figure 12.1.13 (a) and (b) Interpreting the double integral as a volume, the Addition Property says that the volume of the solid over D is equal to the sum of the volume over D1 and the volume over D2, as shown in Figure 12.1.14. A continuous function z = f(x,y) always has a minimum and maximum value on a closed region D. The proof is similar to the one-variable case.
Figure 12.1.14(a) and (b):Addition Property
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