“…For helpful entry points into the dispute, see Cowling (2017, ch. 2), Hoffman & Rosenkrantz (2003), and Lowe (1995). For my own views on the nature of the distinction, see Dumsday (2021;forthcoming). Thankfully, for present purposes it will not be necessary to commit to a single detailed account of the abstract versus concrete divide; the rough-and-ready characterization provided above should suffice for the arguments to follow.…”