Heh, sorry, just noticed this.
Did he mention Psychohistory in-universe? Also, I wonder in addition to all that math, what historical examples did he use?
Also, nice to see a fellow Asimov fan here
IIRC, yes, he did specifically namedrop it when showing his calculations to the Mad Thinker. It was the last FF tie-in to the original Civil War story, although they changed writers to have it penned by the late, great Dwayne McDuffie.
And thank you. Between library check-outs and purchases from the library store I've read my way through much, but not all, of his catalog. I admit I wasn't as much a fan of the later Foundation novels, but the original material with Salvor Hardin and Hober Mallow was well-done, and I actually like that it didn't rely much on action-adventure violence but political savvy and understanding people, economics, etc.
It's why I'm so skeptical about the supposed adaptation due to come out.