  The problem, he says, is that Curry’s paradox “cannot be resolved merely by adopting a system that contains a queer sort of negation”. Rather, “if we want to retain the naive view of truth, or the naive view of classes …, then we must modify the elementary rules of inference relating to ‘if’” (1955: 72). Geach’s view of the significance of Curry’s paradox is closely echoed by Meyer, Routley, and Dunn (1979: 127). They conclude that Curry’s paradox frustrates those who had “hoped that weakening classical negation principles” would  resolve Russell’s  paradox.[20] 