  Logic, it seems, is not about anything in particular; relatedly, it is applicable everywhere, no matter what we are reasoning about. So it is natural to suppose that the logical constants can be marked out as the “topic-neutral” expressions (Ryle 1954, 116; Peacocke 1976, 229; Haack 1978, 5–6; McCarthy 1981, 504; Wright 1983, 133; Sainsbury 2001, 365). We have reason to care about the topic-neutral expressions, and to treat them differently from others, because we are interested in logic as a universal canon for reasoning, one that is applicable not just to reasoning about this or that domain, but to all reasoning.