ratbastard (mattbierwirth)

Race #23278

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Official speed 112.80 wpm (39.47 seconds elapsed during race)
Race Start January 24, 2019 12:04:39am UTC
Race Finish January 24, 2019 12:05:18am UTC
Outcome Win (1 of 2)
Opponents 2. ilka (112.53 wpm)
Accuracy 98.0%
Points 120.32
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.