 These concerns may be waived upon noticing versions of the paradox that do not violate the proposed restrictions on the knowability principle. Williamson (2000a) asks us to consider the following paradox. Let \(p\) be the decidable sentence ‘There is a fragment of Roman pottery at that spot.’ Let \(n\) rigidly designate the number of books actually now on my desk. Let \(E\) be the predicate ‘is even.’ Williamson constructs the conjunction,