In T. Icard & R. Muskens (eds.), Interfaces: Explorations in Logic, Language and Computation. Springer Berlin. pp. 25--37 (2010)

Stefan Wintein
Tilburg University
In Smullyan’s well known logic puzzles, the notion of a knight, which is a creature that always speaks the truth, plays an important role. Rabern and Rabern (2008) made the following observation with respect to knights. They noted that when a knight is asked (1), he gets into serious trouble.
Keywords Smullyan  Liar paradox  self-reference  truth
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