Who? (levitations)

Race #1288

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Official speed 127.28 wpm (34.98 seconds elapsed during race)
Race Start February 26, 2018 3:16:26am UTC
Race Finish February 26, 2018 3:17:01am UTC
Outcome Win (1 of 4)
Opponents 2. siglemic (126.99 wpm)
3. playscrabble (126.92 wpm)
4. etiennescott (113.01 wpm)
Accuracy 98.0%
Points 135.77
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.