 should hold. Similar observations can be made in terms of the Andersonian-Kangerian reduction of SDL. If we read the deontic constant \(d\) atemporally as “all obligations past, present, and future are met”, then the only relevant worlds are those so ideal that in them there has never been a single violation of a mandatory norm. But as a parent, I may be obligated to lock the front door at night even though this would not be a norm unless there had been past violations of other norms (e.g., against theft and murder). People also acquire obligations over time, create them for themselves and for others, discharge them,  etc.[77]