Kenneth (kenthescientist)

Race #362

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Official speed 70.63 wpm (63.03 seconds elapsed during race)
Race Start December 14, 2018 3:47:00pm UTC
Race Finish December 14, 2018 3:48:03pm UTC
Outcome Win (1 of 2)
Accuracy 96.0%
Points 75.33
Text #3640570 (Length: 371 characters)

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.