Professor Rodl, one of my PhD advisors, is in town for a week. So while most of the department is off at some cabin somewhere for a clinic on Ergodic Ramsey Theory, I stay in Prague. We both
I get in in the morning, and Mathias has usurped my desk. The rest of the day, whenever he says "Let n be an integer," I belligerently refuse, insisting that it is very clearly a letter.
I wait on platform 7 of Berlin Haustbahnoft, the central train station in Berlin. Mathias, for whom I am waiting, has already left, from Berlin Ostbahnoft, to the conference we were planning on going to. Deciding, after an
