Doing a PhD is not just about writing a PhD. Fortunately, you can distract yourself with other philosophical activities, that are supposed to be good for you, so that you don't feel so guilty for not being at home working on your thesis in that very moment.
So a good source of educative distraction are the Friday Seminars in my Department. Yesterday it was specially interesting and touching, since we had a Sheffield graduate doing the seminar. It was my good old friend David Liggins, who was a PhD student not long ago, and yesterday he was an invited speaker at the seminar! Quite an event. He suggested a very interesting and somehow intriguing view about how we can communicate using matehmatical statements. For instance, we can communicate something by using the sentence 'The number of penguins at Ely is zero' (which, according to nominalists, is false since it is committed to the existence of numbers), because we all share the belief 'The number of penguins at Ely is Zero iff there are no penguins at Ely'. Therefore, when we hear the former, we can come to believe that there are no penguins at Ely.
This sounds plausible, but I was puzzled by one consequence of the view: if you are a philosopher who does not believe in numbers, then you do not share such a belief, because you think that the right-hand sentence is true while the left-hand sentence is false. Then, this view is not supposed to be true of the very same people that propose it, becase they do not believe in the existence of numbers!