'Logic is not Mathematical' is a collection of the author's recently published papers. It traces a series of egregious errors that the founders of modern logic made, which have been uncorrected to this day largely because of the mathematical and empirical orientation of most of the main protagonists. Whether a piece of language is coherent or incoherent is independent of whether it has factual or fictional content, for one thing, but Logic is a literary subject, the author argues, in more ways than that. For this conclusion is defended in fine detail in a large number of areas by itemizing...