Michael Dummett’s paper “A Defence of McTaggart’s Proof of the Unreality of Time” put forward an ingenious interpretation of McTaggart’s famous proof. My aim in this discussion is not to assess the cogency of McTaggart’s reasoning, but to criticise Dummett’s interpretation of McTaggart.
In this discussion I point out that Max Black offers not one but two arguments against the (logical/metaphysical) possibility of backwards causation. Although both arguments fail in their intended aim, they show something of importance, viz., that defenders of backwards causation should understand Black’s Houdini example (and others like it) in terms of the ‘multiple causes’ model.
In this note, I am critical of some aspects of David Lewis’s resolution of the Grandfather Paradox. In particular, I argue that Lewis gives the wrong explanation of Tim’s inability to kill Grandfather, and that the correct explanation makes essential reference to the self-undermining character of Tim’s grampicide.