 Russell’s paradox  is the most famous of the set-theoretic paradoxes; it arises when one considers the set of all non self-membered sets, the Russell set.  Cantor’s paradox  arises in connection with the universal set. The most famous of the semantic paradoxes is the  Liar paradox.  Although cases for the existence of dialetheias can be made from almost any paradox of self-reference, we will focus only on the Liar, given that it is the most easily understandable and its exposition requires no particular technicalities.