UNCLICK the orange region R but keep R's bounday, just for ease of viewing.
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Well, let's partition the orange region R into rectangles (compare with single integral)
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Folder 1: Partition R using (change in x) = (change in y) = 3.
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UNCLICK Folder 1's icon (icon: folder in a circle).
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Folder 2: Partition R using (change in x) = (change in y) = 3/2 = 1.5.
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UNCLICK Folder 2's icon (icon: folder in a circle).
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Folder 3: Partition R using (change in x) = (change in y) = 3/4 = 0.75
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UNCLICK Folder 3's icon (icon: folder in a circle).
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To see how progress, CLICK: FOLDER 1, then Folder 2, then Folder 3
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QUESTION. What will happen as we take the limit as the change in x an y both tend to zero, which is taking the limit as we put in more and more rectangular boxes?
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Answer.
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All Done.
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Ignore me. For the boundary of R (start with all clicked)
