Let’s get (a little) mathematical. If you’re still reading, good for you!
I spend a fair amount of time reading various logic texts. Most of that time, these days, is spent on texts that are shared with a “Creative Commons” license, and are thus freely downloadable. This is for two reasons: first, I am deeply offended by contemporary text book prices. For example, Hurley’s logic book (you can look that up on your own) is around $100.00 for the more recent editions. Not as bad as Calculus text books, but certainly extreme when one considers that the material presented can be had for free from other sources. So, despite the overwhelming improbability of it ever occurring, I can’t stop myself from thinking about the scam inherent in textbook pricing, and thinking how I, as a would-be teacher, might better serve my students w/o bankrupting them.
The second reason is that I just really like the subject, and want to keep my nose in the books on this subject at all times. Like playing the cello, if you stop practicing, you lose whatever mastery you may once have possessed. (The cello analogy is in reference to the great Pablo Casals and the possibly apocryphal response(s) he gave to why he always practiced so diligently.) Since I am otherwise utterly penurious, my choice of texts to “practice” with are limited to what I can download for free. With respect to topics within mathematics, including formal logic, the range of materials is actually enormous, and the quality exceptionally good. One of these books is the Open Logic Text by the Open Logic Group (“OL”), licensed under Creative Commons international attribution 4.0. (I believe I have fulfilled my legal obligations in the forgoing; full .PDF HERE.) I very much approve of this text, and almost anyone but me would never have even the slightest critique to offer regarding its exceptionally comprehensive coverage of the topic in a readily understandable fashion. But I do have one criticism, one that pretty much no one but a Whiteheadian would ever think to make. And that is about their too sanguine opening about the centrality of sets, and their uncritical acceptance of an intransigently object structured thinking. Continue reading