Michael, I very strongly agree with the intro to your forthcoming book. In 2015, I presented the following slides about natural logic: http://jfsowa.com/talks/natlog.pdf Since then, I've published a couple of articles on these topics, and I updated and revised some of the points. I'll say more about that in another note. But these slides present an overview of the issues I've been addressing. The following slides, which I developed into a formal article, address related issues: http://jfsowa.com/talks/ppe.pdf . John
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