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math.LO2010
On Tarski's Undefinability Theorem
Stephen Boyce
This paper shows that Tarski's revised Undefinability Theorem obscures a liar paradox affecting various systems in scope. Consider for example Tarski's general theory of classes (w…
math.LO2009
On Chwistek's criticism of Principia
Stephen Boyce
This paper examines Chwistek's claim that with Principia's definition of a class "Richard's paradox can be formulated". It is shown that the demonstration fails since it requires a…