 Deep and interesting discussions of the epistemic operators and/or temporal analogs in the context of Fitch’s paradox appear in many papers. Burgess (2009) considers the temporal analogs. van Benthem (2004; 2009), van Ditmarsh, et al. (2012), Berto et al. (forthcoming) and Holliday (2018) explore the problem in dynamic epistemic frameworks. Palczewski (2007), Kelp and Pritchard (2009), Chase et al. (2018), and Heylen (forthcoming) consider non-factive notions of knowledge and knowability. Linsky (2009), Paseau (2008), Jago (2010), Carrara et al. (2011), and Rosenblatt (2014) debate the prospects for typing knowledge. 