Lazar (itqchi_)

Race #78

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Official speed 48.16 wpm (92.44 seconds elapsed during race)
Race Start September 8, 2018 3:40:27pm UTC
Race Finish September 8, 2018 3:42:00pm UTC
Outcome No win (2 of 3)
Opponents 1. critias26 (60.88 wpm)
Accuracy 96.0%
Points 51.37
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.