 Bigelow suggests that this argument goes as far back as the Stoics and Epicureans. Here we focus on contemporary iterations of the problem. For recent discussion of the problem, in a variety of forms, see Adams (1986: 321–8), Quine (1987: 197–8), Chisholm (1990a,b), Bigelow (1996), Sider (1999, 2001: 25–35), Craig (2000: 211–2), Davidson (2003), Markosian (2004), Crisp (2005), Brogaard (2006, 2013), De Clercq (2006), Torrengo (2006, 2010), Inman (2012), Ciuni &amp; Torrengo (2013), and Ingthorsson (2019). For a substantial, book-length treatment of the issue, see Torrengo (2008).