spectating a spectator (mporsche02)

Race #4763

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Official speed 167.99 wpm (26.50 seconds elapsed during race)
Race Start April 19, 2019 7:55:37pm UTC
Race Finish April 19, 2019 7:56:03pm UTC
Outcome Win (1 of 3)
Opponents 3. keegant (91.52 wpm)
Accuracy 99.0%
Points 179.19
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.