 For statements of this argument, see Crisp (2004: 17) and Ludlow (2004: 22). For discussion of the (so-called) “sceptical” challenge, in a variety of forms, see Merricks (1995: 523, 1999: 421–2), Zimmerman (1998: 209–10), Lombard (1999: 254–5, 2010), Sider (1999: 325–7, 2006), Callender (2000: S588–90), Rea (2003), Meyer (2005, 2013), Savitt (2006), Stoneham (2009), Mozersky (2011: 122–5), Torrengo (2012, 2016), Miller (2013: 348–51), Tallant (2014), Deng (2018), and Deasy (2019b), amongst others.