These are the slides from my lightning J introduction for the "Seven Languages in Seven Months" Meetup on 1/21/2014 (pdfs) in two parts.

First, we have the general introduction to the cognitive principles underlying the utility of a terse notation: File:Jintro27Lang7Mo-Pt0.pdf.

Then, we get down to the nitty-gritty, deep technical aspects of the J notation: File:Jintro27Lang7Mo-Pt1.pdf.