The explosive progress of logic, since Frege, has produced applications in linguistics, mathematics and computer science. Students and practitioners of any of these fields, and of philosophy, will find this book an excellent reference or introduction. Now expanded to include non-classical logic, logic for the computer, and more. The central concepts are explained as they come into play in informal writing and conversation--argument, validity, relevance, and so on. This study guide progresses to concepts such as probability calculus.
This was in the Philosophy section, but it happens a lot that bookstore staff can't tell legitimate works from bullshit; Deepak Chopra ends up in the Science section, Neurobiology ends up in Psychology, creationists end up in Biology, and Mathematics ends up in Philosophy. Not this time, however: this one was clearly written for and by Philosophy majors, and as such any substance that it has can be summed up on half an A4. I suppose it might be of use to a middle-schooler, if his elementary school missed out on the New Math.