So I was stuck on a bus from Ghent to Sopot for around 20 hours. I had on me my laptop and a bunch of papers to read, among them Leitgeb's What is a self-referential sentence? Critical remarks on the alleged (non-)circularity of Yablo's paradox (2002), Logique et Analyse 177-178, 3-14. It's a fun paper and I really got into it. To the extent that I decided to spend a few hours typing up a note about this stuff. Here is a fairly sketchy first draft. Abstract below. All comments welcome. Abstract. Leitgeb (2002) objects against the clarity of the debate about the alleged (non-)circularity of Yablo's paradox, arguing that there are actually two notions of self-reference and circularity at play. One, on which Yablo's paradox is not circular, is defined via the reference of the constituents of a sentence, and another, on which the paradox is circular, is defined via syntactic mappings and fixed points. More importantly, Leitgeb argues that both definitions aren'