Thus, if we know that A has happened and that P(B|A) is greater than 1/2, then if we must base a course of action on whether B occurs or not, we must suppose that B, and not its negation, will occur.[4] In this way we see that not only strict entailment, but also partial entailment, yields a form of rational compulsion.The question now remains, Why will not rational compulsion do as an account of epi