swedish crabi (thunberg123)

Race #58585

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Official speed 102.64 wpm (43.37 seconds elapsed during race)
Race Start September 22, 2017 8:09:26pm UTC
Race Finish September 22, 2017 8:10:10pm UTC
Outcome Win (1 of 4)
Opponents 2. justiceex (89.87 wpm)
Accuracy 98.0%
Points 109.49
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.