ABSTRACT
The underlying Humean theory of causal laws can be interpreted as a theory of meaning or of justification and as claiming more weakly that the events be specified under their known or only under some other possible set of descriptions. It entails the thesis of regularity
determinism, viz. that for every x there is a set of events y1…yn such that they are regularly conjoined under some set of descriptions. This is different from the principle of ubiquity determinism which stipulates merely that every event must have a real cause-that is, that there must be causes for changes and differences, which is one formulation of the principle of sufficient reason.
