Abstract for Diamond’s talk

“There is nothing else to think but that p” may mean that there are considerations that go conclusively against the alternatives; but it might instead mean that there is no thought that is an alternative to p.  If you deny p, what you say “peters out into nothingness”, to quote Anscombe on one such case.  But can the negation of a muddle be anything but a muddle?  I consider various cases of propositions that apparently lack an intelligible negation.