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The short answer (to the question in the title) is so that you don't need to worry about whether E is measurable. If you happen to know that E is measurable then you can drop "outer" everywhere. There may be a longer answer (better addressing the question as stated in the page) involving specific applications where E is in fact nonmeasurable, but I personally don't know of such applications offhand. |
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The short answer is so that you don't need to worry about whether E is measurable. If you happen to know that E is measurable then you can drop "outer" everywhere. There may be a longer answer involving specific applications where E is in fact nonmeasurable, but I personally don't know of such applications offhand. |
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