 which is not in \(\Delta\). If \(\Delta\) is stable, every member of \(\Delta\) must remain true under the counterfactual supposition that \(\neg\)A\(\vee \neg B\), since this supposition is compatible with every member of \(\Delta\). However, Lange (2005, 421) argues that there are at least some conversational contexts in which \(A\) does not have priority over \(B\). Hence, \(\neg A \vee \neg B \rightarrow A\) is not the case, and therefore \(\Delta\) is not stable under the counterfactual supposition \(\neg A\vee \neg B\). By contrast, according to Lange, a law of nature has priority over any accidental truth in every context, and thus the laws of nature form a stable set. 