Factive Knowability and the Problem of Possible Omniscience

There are several factive concepts of knowability, in particular the notion of having the possiblity to know that something is actually the case (Edgington) and having the potential to know (Fuhrmann). Both notions have been used to circumvent the Church-Fitch paradox of knowability. But even if one can block the possibility to derive omniscience, it does not mean one can block the derivation of possible omniscience. Edgington's and Furhmann's knowability theses have this unwanted consequence. This will be shown on the basis of the formal models for both notions.status: publishe