 The second argument is from epistemic states. When we consider real-world finite and fallible epistemic agents, there seem to be no rules of the form: if someone believes \(A_1, A_2,\ldots\), then they must believe (distinct) \(B\) (that’s why the logical omniscience problem discussed in 2.3 is hard!). If we model their epistemic states in terms of worlds, then at least one of the worlds must break the inference from \(A_1, A_2,\ldots\) to \(B.\) So each logical inference (except \(A \vDash A)\) is broken by some world (Jago 2014a; Priest 2016).