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Racer Allan (_allan)
Race Number 153
Date Thu, 5 Oct 2017 18:28:30 +0000
Speed 76 WPM Try to beat?
Accuracy 95.6%
Rank 2nd place (out of 2)

Text typed:

Property (c) is known as countable additivity. It is not something that can be proved, but it is like an assumption or an axiom. In our experience, we have seen that operating as if the assumption is correct leads to useful and credible answers to many problems, so we accept it as a reasonable assumption. Not all probabilists agree that countable additivity is natural.
Fundamentals of Probability: A First Course (book) by Anirban DasGupta (see stats)

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